NEGUSIE v. HOLDER

on writ of certiorari to the united states court ofappeals for the fifth circuit

[March 3, 2009]

Justice Kennedy delivered the opinion of the Court.

An alien who fears persecution in his homeland and seeks refugee status in this country is barred from obtaining that relief if he has persecuted others.

The term refugee does not include any person who ordered, incited, assisted, or otherwise participated in the persecution of any person on account of race, religion, nationality, membership in a particular social group, or political opinion. Immigration and Nationality Act (INA), §101,
66Stat.
166, as added by Refugee Act of 1980, §201(a),
94Stat.
102103,
8 U. S. C. §1101(a)(42).

In this case the Board of Immigration Appeals (BIA) determined that the persecutor bar applies even if the aliens assistance in persecution was coerced or otherwise the product of duress. In so ruling the BIA followed its earlier decisions that found Fedorenko v. United States,
449 U. S. 490 (1981)
, controlling. The Court of Appeals for the Fifth Circuit, in affirming the agency, relied on its precedent following the same reasoning. We hold that the BIA and the Court of Appeals misapplied Fedorenko. We reverse and remand for the agency to interpret the statute, free from the error, in the first instance.

I

Petitioner in this Court is Daniel Girmai Negusie, a dual national of Eritrea and Ethiopia, his father having been a national of the former and his mother of the latter. Born and educated in Ethiopia, he left there for Eritrea around the age of 18 to see his mother and find employment. The year was 1994. After a few months in Eritrea, state officials took custody of petitioner and others when they were attending a movie. He was forced to perform hard labor for a month and then was conscripted into the military for a time. War broke out between Ethiopia and Eritrea in 1998, and he was conscripted again.

When petitioner refused to fight against Ethiopia, his other homeland, the Eritrean Government incarcerated him. Prison guards punished petitioner by beating him with sticks and placing him in the hot sun. He was released after two years and forced to work as a prison guard, a duty he performed on a rotating basis for about four years. It is undisputed that the prisoners he guarded were being persecuted on account of a protected groundi.e., race, religion, nationality, membership in a particular social group, or political opinion.
8 U. S. C. §1101(a)(42). Petitioner testified that he carried a gun, guarded the gate to prevent escape, and kept prisoners from taking showers and obtaining fresh air. He also guarded prisoners to make sure they stayed in the sun, which he knew was a form of punishment. He saw at least one man die after being in the sun for more than two hours. Petitioner testified that he had not shot at or directly punished any prisoner and that he helped prisoners on various occasions. Petitioner escaped from the prison and hid in a container, which was loaded on board a ship heading to the United States. Once here he applied for asylum and withholding of removal.

In a careful opinion the Immigration Judge, W. Wayne Stogner, found that petitioners testimony, for the most part, was credible. He concluded that petitioner assisted in persecution by working as an armed guard. The judge determined that although theres no evidence to establish that [petitioner] is a malicious person or that he was an aggressive person who mistreated the prisoners, . . . the very fact that he helped [the government] in the prison compound where he had reason to know that they were persecuted constitutes assisting in the persecution of others and bars [petitioner] from obtaining asylum or withholding of removal. App. to Pet. for Cert. 16a17a (citing, inter alia, Fedorenko, supra). The judge, however, granted deferral of removal under CAT because petitioner was likely to be tortured if returned to Eritrea.

The BIA affirmed the denial of asylum and withholding. It noted petitioners role as an armed guard in a facility where prisoners were tortured and left to die out in the sun . . . on account of a protected ground. App. to Pet. for Cert. 6a. The BIA held that [t]he fact that [petitioner] was compelled to participate as a prison guard, and may not have actively tortured or mistreated anyone, is immaterial. Ibid. That is because  an aliens motivation and intent are irrelevant to the issue of whether he assisted in persecution . . . [I]t is the objective effect of an aliens actions which is controlling.  Ibid. (quoting Matter of Fedorenko, 19 I. & N. Dec. 57, 69 (BIA 1984)). The BIA also affirmed the grant of deferral of removal under CAT.

On petition for review the Court of Appeals agreed with the BIA that whether an alien is compelled to assist in persecution is immaterial for persecutor-bar purposes. App. to Pet. for Cert. 2a (citing Fedorenko, 449 U. S., at 512, n. 34). We granted certiorari. 552 U. S. ___ (2008).

II

Consistent with the rule in Chevron U. S. A. Inc. v. Natural Resources Defense Council, Inc.,
467 U. S. 837,
842843 (1984)
, the BIA is entitled to deference in interpreting ambiguous provisions of the INA. The question here is whether an alien who was compelled to assist in persecution can be eligible for asylum or withholding of removal. We conclude that the BIA misapplied our precedent in Fedorenko as mandating that an aliens motivation and intent are irrelevant to the issue whether an alien assisted in persecution. The agency must confront the same question free of this mistaken legal premise.

A

It is well settled that principles of Chevron deference are applicable to this statutory scheme. INS v. Aguirre-Aguirre,
526 U. S. 415,
424 (1999)
. Congress has charged the Attorney General with administering the INA, and a ruling by the Attorney General with respect to all questions of law shall be controlling.
8 U. S. C. §1103(a)(1). Judicial deference in the immigration context is of special importance, for executive officials exercise especially sensitive political functions that implicate questions of foreign relations. INS v. Abudu,
485 U. S. 94,
100 (1988)
. The Attorney Generals decision to bar an alien who has participated in persecution may affect our relations with [the aliens native] country or its neighbors. The judiciary is not well positioned to shoulder primary responsibility for assessing the likelihood and importance of such diplomatic repercussions. Aguirre-Aguirre, 526 U. S., at 425.

The Attorney General, in turn, has delegated to the BIA the  discretion and authority conferred upon the Attorney General by law  in the course of  considering and determining cases before it.  Ibid. (quoting
8 CFR §3.1(d)(1) (1998)). As a consequence, the BIA should be accorded Chevron deference as it gives ambiguous statutory terms concrete meaning through a process of case-by-case adjudication.  Aguirre-Aguirre, supra, at 425 (quoting INS v. Cardoza-Fonseca,
480 U. S. 421,
448449 (1987)
). When the BIA has not spoken on a matter that statutes place primarily in agency hands, our ordinary rule is to remand to giv[e] the BIA the opportunity to address the matter in the first instance in light of its own experience. INS v. Orlando Ventura,
537 U. S. 12,
1617 (2002)
(per curiam).

B

The parties disagree over whether coercion or duress is relevant in determining if an alien assisted or otherwise participated in persecution. As there is substance to both contentions, we conclude that the statute has an ambiguity that the agency should address in the first instance.

Petitioner argues that the statutes plain language makes clear that involuntary acts do not implicate the persecutor bar because  persecution  presumes moral blameworthiness. Brief for Petitioner 2328. He invokes principles of criminal culpability, concepts of international law, and the rule of lenity. Id., at 2845. Those arguments may be persuasive in determining whether a particular agency interpretation is reasonable, but they do not demonstrate that the statute is unambiguous. Petitioner all but conceded as much at argument in this Court when he indicated that the BIA has discretion to construe the duress defense in either a narrow or a broad way. Tr. of Oral Arg. 2024.

The Government, on the other hand, asserts that the statute does not allow petitioners construction. The statutory text, the Government says, directly answers that question: there is no exception for conduct that is coerced because Congress did not include one. Brief for Respondent 11. We disagree. The silence is not conclusive. The question is whether the statutory text mandates that coerced actions must be deemed assistance in persecution. On that point the statute, in its precise terms, is not explicit. Nor is this a case where it is clear that Congress had an intention on the precise question at issue. Cf. Cardoza-Fonseca, supra, at 448449.

The Government, like the BIA and the Court of Appeals, relies on Fedorenko to provide the answer. This reliance is not without some basis, as the Court there held that voluntariness was not required with respect to another persecutor bar. 449 U. S., at 512. To the extent, however, the Government deems Fedorenko to be controlling, it is in error.

In Fedorenko, the Court interpreted the Displaced Persons Act of 1948 (DPA),
62Stat.
1009. The DPA was enacted to enable European refugees driven from their homelands by the [second world] war to emigrate to the United States without regard to traditional immigration quotas. 449 U. S., at 495. Section 2(b) of the DPA provides relief to any displaced person or refugee as defined in Annex I of the Constitution of the International Refugee Organization of the United Nations (IRO Constitution).
62Stat.
1009. The IRO Constitution, as codified by Congress, excludes any individual who can be shown: (a) to have assisted the enemy in persecuting civil populations of countries, Members of the United Nations; or (b) to have voluntarily assisted the enemy forces since the outbreak of the second world war in their operations against the United Nations. Annex I, Part II, §2,
62Stat.
30513052.

The Fedorenko Court held that an individuals service as a concentration camp armed guardwhether voluntary or involuntarymade him ineligible for a visa under §2(a) of the IRO Constitution. 449 U. S., at 512. That Congress did not adopt a voluntariness requirement for §2(a), the Court noted, is plain from comparing §2(a) with §2(b), which excludes only those individuals who voluntarily assisted the enemy forces.  Ibid. The Court relied on the principle of statutory construction that the deliberate omission of the word voluntary from §2(a) compels the conclusion that the statute made all those who assisted in persecution of civilians ineligible for visas. Ibid.

Fedorenko does not compel the same conclusion in the case now before us. The textual structure of the statute in Fedorenko (voluntary is in one subsection but not the other) is not part of the statutory framework considered here. Congress did not use the word voluntary in any subsection of the persecutor bar, so its omission cannot carry the same significance.

The difference between the statutory scheme in Fedorenko and the one here is confirmed when we  look not only to the particular statutory language, but to the design of the statute as a whole and to its object and policy.  Dada v. Mukasey,
554 U. S. 1, ___ (2008) (slip op., at 13) (quoting Gozlon-Peretz v. United States,
498 U. S. 395,
407 (1991)
). Both statutes were enacted to reflect principles set forth in international agreements, but the principles differ in significant respects.

As discussed, Congress enacted the DPA in 1948 as part of an international effort to address individuals who were forced to leave their homelands during and after the second World War. Fedorenko, supra, at 495. The DPA excludes those who voluntarily assisted the enemy forces since the outbreak of the second world war,
62Stat.
3052, as well as all who assisted the enemy in persecuting civil populations of countries, id., at 3051. The latter exclusion clause makes no reference to culpability. The exclusion of even those involved in nonculpable, involuntary assistance in Nazi persecution, as an expert testified in Fedorenko, may be  [b]ecause the crime against humanity that is involved in the concentration camp puts it into a different category.  449 U. S., at 511, n. 32.

The persecutor bar in this case, by contrast, was enacted as part of the Refugee Act of 1980. Unlike the DPA, which was enacted to address not just the post war refugee problem but also the Holocaust and its horror, the Refugee Act was designed to provide a general rule for the ongoing treatment of all refugees and displaced persons. As this Court has twice recognized,  one of Congress primary purposes in passing the Refugee Act was to implement the principles agreed to in the 1967 United Nations Protocol Relating to the Status of Refugees, Jan. 31, 1967, 19 U. S. T. 6224, T. I. A. S. 6577 (1968), as well as the United Nations Convention Relating to the Status of Refugees, 189 U. N. T. S. 150 (July 28, 1951), reprinted in 19 U. S. T. 6259. Aguirre-Aguirre, 526 U. S., at 427 (quoting Cardoza-Fonseca, 480 U. S., at 436437).

These authorities illustrate why Fedorenko, which addressed a different statute enacted for a different purpose, does not control the BIAs interpretation of this persecutor bar. Whatever weight or relevance these various authorities may have in interpreting the statute should be considered by the agency in the first instance, and by any subsequent reviewing court, after our remand.

C

The Government argues that if there were any ambiguity in the text, the Boards determination that the bar contains no such exception is reasonable and thus controlling. Brief for Respondent 11. Whether such an interpretation would be reasonable, and thus owed Chevron deference, is a legitimate question; but it is not now before us. The BIA deemed its interpretation to be mandated by Fedorenko, and that error prevented it from a full consideration of the statutory question here presented.

In denying relief in this case the BIA recited a rule that has developed in its own case law in reliance on Fedorenko: [A]n aliens motivation and intent are irrelevant to the issue of whether he assisted in persecution . . . [I]t is the objective effect of an aliens actions which is controlling. App. to Pet. for Cert. 6a. The rule is based on three earlier decisions: Matter of Laipenieks, 18 I. & N. Dec. 433 (1983); Matter of Fedorenko, 19 I. & N. Dec. 57; and Matter of Rodriguez-Majano, 19 I. & N. Dec. 811 (1988).

In Matter of Laipenieks, the BIA applied the Courts Fedorenko analysis of the DPA to a different postwar statute, which provided for the deportation of anyone associated with the Nazis who ordered, incited, assisted, or otherwise participated in persecution based on a protected ground.
8 U. S. C. §1182(a)(3)(E)(i). Finding no agency or judicial decision on point, the BIA relied on Fedorenko. It recognized that the unique structure of the Fedorenko statute was not present in §1182(a)(3)(E)(i), but the BIA nevertheless adopted wholesale the Fedorenko rule: [A]s in Fedorenko, . . . the plain language of [§1182(a)(3)(E)(i)] mandates a literal interpretation, and the omission of an intent element compels the conclusion that [§1182(a)(3)(E)(i)] makes all those who assisted in the specific persecution deportable. 18 I. & N. Dec., at 464. In other words, particular motivations or intent . . . is not a relevant factor. Ibid.

The second decision, Matter of Fedorenko, also dealt with §1182(a)(3)(E)(i), and it involved the same alien whose citizenship was revoked by this Courts Fedorenko decision. This time the agency sought to deport him. Fedorenko responded by requesting suspension of deportation. He argued that, unlike the DPAs bar on any assistancevoluntary or involuntaryin persecution, see Fedorenko, 449 U. S., at 512, the text and structure of §1182(a)(3)(E)(i) required deportation only of those who voluntarily assisted in persecuting others. The BIA rejected that distinction, noting that it was foreclosed by Matter of Laipenieks: It may be, as [Fedorenko] argues, that his service at Treblinka was involuntary. . . . We need not resolve the issue, however, because as a matter of law [Fedorenkos] motivations for serving as a guard at Treblinka are immaterial to the question of his deportability under §1182(a)(3)(E)(i). 19 I. & N. Dec., at 6970.

Later, the BIA applied this Courts Fedorenko rule to the persecutor bar that is at issue in the present case. In Matter of Rodriguez-Majano, the BIA granted relief because the aliens coerced conduct as a guerrilla was not persecution based on a protected ground. 19 I. & N. Dec., at 815816. Nevertheless, in reaching its conclusion the BIA incorporated without additional analysis the Fedorenko rule as applied in Matter of Laipenieks and reiterated in Matter of Fedorenko. 19 I. & N. Dec., at 814815. The BIA reaffirmed that [t]he participation or assistance of an alien in persecution need not be of his own volition to bar him from relief. Id., at 814 (citing Fedorenko,
449 U. S. 490).

Our reading of these decisions confirms that the BIA has not exercised its interpretive authority but, instead, has determined that Fedorenko controls. This mistaken assumption stems from a failure to recognize the inapplicability of the principle of statutory construction invoked in Fedorenko, as well as a failure to appreciate the differences in statutory purpose. The BIA is not bound to apply the Fedorenko rule that motive and intent are irrelevant to the persecutor bar at issue in this case. Whether the statute permits such an interpretation based on a different course of reasoning must be determined in the first instance by the agency.

Justice Stevens would have the Court provide a definite answer to the question presented and then remand for further proceedings. That approach, however, is in tension with the ordinary remand rule. Ventura, supra, at 18; see also Cajun Elec. Power Cooperative, Inc. v. FERC, 924 F. 2d 1132, 1136 (CADC 1991) (opinion for the Court by Silberman, J., joined by R. Ginsburg and Thomas, JJ.) ([I]f an agency erroneously contends that Congress intent has been clearly expressed and has rested on that ground, we remand to require the agency to consider the question afresh in light of the ambiguity we see). Thomas is illustrative. There, the agency had not determined whether a family may constitute a social group for the purposes of refugee status. The Ninth Circuit held that the family can constitute a protected social group and that the particular family at issue did qualify. 547 U. S., at 184185. The Solicitor General sought review in this Court on whether the Ninth Circuit erred in holding, in the first instance and without prior resolution of the questions by the relevant administrative agency, that members of a family can and do constitute a particular social group, within the meaning of the Act. Id., at 185 (internal quotation marks omitted). He argued that the Ninth Circuits decision violated the Ventura ordinary remand rule. We agreed and summarily reversed. 547 U. S., at 184185

Ventura and Thomas counsel a similar result here. Because of the important differences between the statute before us and the one at issue in Fedorenko, we find it appropriate to remand to the agency for its initial determination of the statutory interpretation question and its application to this case. The agencys interpretation of the statutory meaning of persecution may be explained by a more comprehensive definition, one designed to elaborate on the term in anticipation of a wide range of potential conduct; and that expanded definition in turn may be influenced by how practical, or impractical, the standard would be in terms of its application to specific cases. These matters may have relevance in determining whether its statutory interpretation is a permissible one.

As the Court said in Ventura and reiterated in Thomas,  [t]he agency can bring its expertise to bear upon the matter; it can evaluate the evidence; it can make an initial determination; and, in doing so, it can, through informed discussion and analysis, help a court later determine whether its decision exceeds the leeway that the law provides.  547 U. S., at 186187 (quoting Ventura, supra, at 17). If the BIA decides to adopt a standard that considers voluntariness to some degree, it may be prudent and necessary for the Immigration Judge to conduct additional factfinding based on the new standard. Those determinations are for the agency to make in the first instance.

***

We reverse the judgment of the Court of Appeals and remand the case for further proceedings consistent with this opinion.

on writ of certiorari to the united states court ofappeals for the fifth circuit

[March 3, 2009]

Justice Kennedy delivered the opinion of the Court.

An alien who fears persecution in his homeland and seeks refugee status in this country is barred from obtaining that relief if he has persecuted others.

The term refugee does not include any person who ordered, incited, assisted, or otherwise participated in the persecution of any person on account of race, religion, nationality, membership in a particular social group, or political opinion. Immigration and Nationality Act (INA), §101,
66Stat.
166, as added by Refugee Act of 1980, §201(a),
94Stat.
102103,
8 U. S. C. §1101(a)(42).

In this case the Board of Immigration Appeals (BIA) determined that the persecutor bar applies even if the aliens assistance in persecution was coerced or otherwise the product of duress. In so ruling the BIA followed its earlier decisions that found Fedorenko v. United States,
449 U. S. 490 (1981)
, controlling. The Court of Appeals for the Fifth Circuit, in affirming the agency, relied on its precedent following the same reasoning. We hold that the BIA and the Court of Appeals misapplied Fedorenko. We reverse and remand for the agency to interpret the statute, free from the error, in the first instance.

I

Petitioner in this Court is Daniel Girmai Negusie, a dual national of Eritrea and Ethiopia, his father having been a national of the former and his mother of the latter. Born and educated in Ethiopia, he left there for Eritrea around the age of 18 to see his mother and find employment. The year was 1994. After a few months in Eritrea, state officials took custody of petitioner and others when they were attending a movie. He was forced to perform hard labor for a month and then was conscripted into the military for a time. War broke out between Ethiopia and Eritrea in 1998, and he was conscripted again.

When petitioner refused to fight against Ethiopia, his other homeland, the Eritrean Government incarcerated him. Prison guards punished petitioner by beating him with sticks and placing him in the hot sun. He was released after two years and forced to work as a prison guard, a duty he performed on a rotating basis for about four years. It is undisputed that the prisoners he guarded were being persecuted on account of a protected groundi.e., race, religion, nationality, membership in a particular social group, or political opinion.
8 U. S. C. §1101(a)(42). Petitioner testified that he carried a gun, guarded the gate to prevent escape, and kept prisoners from taking showers and obtaining fresh air. He also guarded prisoners to make sure they stayed in the sun, which he knew was a form of punishment. He saw at least one man die after being in the sun for more than two hours. Petitioner testified that he had not shot at or directly punished any prisoner and that he helped prisoners on various occasions. Petitioner escaped from the prison and hid in a container, which was loaded on board a ship heading to the United States. Once here he applied for asylum and withholding of removal.

In a careful opinion the Immigration Judge, W. Wayne Stogner, found that petitioners testimony, for the most part, was credible. He concluded that petitioner assisted in persecution by working as an armed guard. The judge determined that although theres no evidence to establish that [petitioner] is a malicious person or that he was an aggressive person who mistreated the prisoners, . . . the very fact that he helped [the government] in the prison compound where he had reason to know that they were persecuted constitutes assisting in the persecution of others and bars [petitioner] from obtaining asylum or withholding of removal. App. to Pet. for Cert. 16a17a (citing, inter alia, Fedorenko, supra). The judge, however, granted deferral of removal under CAT because petitioner was likely to be tortured if returned to Eritrea.

The BIA affirmed the denial of asylum and withholding. It noted petitioners role as an armed guard in a facility where prisoners were tortured and left to die out in the sun . . . on account of a protected ground. App. to Pet. for Cert. 6a. The BIA held that [t]he fact that [petitioner] was compelled to participate as a prison guard, and may not have actively tortured or mistreated anyone, is immaterial. Ibid. That is because  an aliens motivation and intent are irrelevant to the issue of whether he assisted in persecution . . . [I]t is the objective effect of an aliens actions which is controlling.  Ibid. (quoting Matter of Fedorenko, 19 I. & N. Dec. 57, 69 (BIA 1984)). The BIA also affirmed the grant of deferral of removal under CAT.

On petition for review the Court of Appeals agreed with the BIA that whether an alien is compelled to assist in persecution is immaterial for persecutor-bar purposes. App. to Pet. for Cert. 2a (citing Fedorenko, 449 U. S., at 512, n. 34). We granted certiorari. 552 U. S. ___ (2008).

II

Consistent with the rule in Chevron U. S. A. Inc. v. Natural Resources Defense Council, Inc.,
467 U. S. 837,
842843 (1984)
, the BIA is entitled to deference in interpreting ambiguous provisions of the INA. The question here is whether an alien who was compelled to assist in persecution can be eligible for asylum or withholding of removal. We conclude that the BIA misapplied our precedent in Fedorenko as mandating that an aliens motivation and intent are irrelevant to the issue whether an alien assisted in persecution. The agency must confront the same question free of this mistaken legal premise.

A

It is well settled that principles of Chevron deference are applicable to this statutory scheme. INS v. Aguirre-Aguirre,
526 U. S. 415,
424 (1999)
. Congress has charged the Attorney General with administering the INA, and a ruling by the Attorney General with respect to all questions of law shall be controlling.
8 U. S. C. §1103(a)(1). Judicial deference in the immigration context is of special importance, for executive officials exercise especially sensitive political functions that implicate questions of foreign relations. INS v. Abudu,
485 U. S. 94,
100 (1988)
. The Attorney Generals decision to bar an alien who has participated in persecution may affect our relations with [the aliens native] country or its neighbors. The judiciary is not well positioned to shoulder primary responsibility for assessing the likelihood and importance of such diplomatic repercussions. Aguirre-Aguirre, 526 U. S., at 425.

The Attorney General, in turn, has delegated to the BIA the  discretion and authority conferred upon the Attorney General by law  in the course of  considering and determining cases before it.  Ibid. (quoting
8 CFR §3.1(d)(1) (1998)). As a consequence, the BIA should be accorded Chevron deference as it gives ambiguous statutory terms concrete meaning through a process of case-by-case adjudication.  Aguirre-Aguirre, supra, at 425 (quoting INS v. Cardoza-Fonseca,
480 U. S. 421,
448449 (1987)
). When the BIA has not spoken on a matter that statutes place primarily in agency hands, our ordinary rule is to remand to giv[e] the BIA the opportunity to address the matter in the first instance in light of its own experience. INS v. Orlando Ventura,
537 U. S. 12,
1617 (2002)
(per curiam).

B

The parties disagree over whether coercion or duress is relevant in determining if an alien assisted or otherwise participated in persecution. As there is substance to both contentions, we conclude that the statute has an ambiguity that the agency should address in the first instance.

Petitioner argues that the statutes plain language makes clear that involuntary acts do not implicate the persecutor bar because  persecution  presumes moral blameworthiness. Brief for Petitioner 2328. He invokes principles of criminal culpability, concepts of international law, and the rule of lenity. Id., at 2845. Those arguments may be persuasive in determining whether a particular agency interpretation is reasonable, but they do not demonstrate that the statute is unambiguous. Petitioner all but conceded as much at argument in this Court when he indicated that the BIA has discretion to construe the duress defense in either a narrow or a broad way. Tr. of Oral Arg. 2024.

The Government, on the other hand, asserts that the statute does not allow petitioners construction. The statutory text, the Government says, directly answers that question: there is no exception for conduct that is coerced because Congress did not include one. Brief for Respondent 11. We disagree. The silence is not conclusive. The question is whether the statutory text mandates that coerced actions must be deemed assistance in persecution. On that point the statute, in its precise terms, is not explicit. Nor is this a case where it is clear that Congress had an intention on the precise question at issue. Cf. Cardoza-Fonseca, supra, at 448449.

The Government, like the BIA and the Court of Appeals, relies on Fedorenko to provide the answer. This reliance is not without some basis, as the Court there held that voluntariness was not required with respect to another persecutor bar. 449 U. S., at 512. To the extent, however, the Government deems Fedorenko to be controlling, it is in error.

In Fedorenko, the Court interpreted the Displaced Persons Act of 1948 (DPA),
62Stat.
1009. The DPA was enacted to enable European refugees driven from their homelands by the [second world] war to emigrate to the United States without regard to traditional immigration quotas. 449 U. S., at 495. Section 2(b) of the DPA provides relief to any displaced person or refugee as defined in Annex I of the Constitution of the International Refugee Organization of the United Nations (IRO Constitution).
62Stat.
1009. The IRO Constitution, as codified by Congress, excludes any individual who can be shown: (a) to have assisted the enemy in persecuting civil populations of countries, Members of the United Nations; or (b) to have voluntarily assisted the enemy forces since the outbreak of the second world war in their operations against the United Nations. Annex I, Part II, §2,
62Stat.
30513052.

The Fedorenko Court held that an individuals service as a concentration camp armed guardwhether voluntary or involuntarymade him ineligible for a visa under §2(a) of the IRO Constitution. 449 U. S., at 512. That Congress did not adopt a voluntariness requirement for §2(a), the Court noted, is plain from comparing §2(a) with §2(b), which excludes only those individuals who voluntarily assisted the enemy forces.  Ibid. The Court relied on the principle of statutory construction that the deliberate omission of the word voluntary from §2(a) compels the conclusion that the statute made all those who assisted in persecution of civilians ineligible for visas. Ibid.

Fedorenko does not compel the same conclusion in the case now before us. The textual structure of the statute in Fedorenko (voluntary is in one subsection but not the other) is not part of the statutory framework considered here. Congress did not use the word voluntary in any subsection of the persecutor bar, so its omission cannot carry the same significance.

The difference between the statutory scheme in Fedorenko and the one here is confirmed when we  look not only to the particular statutory language, but to the design of the statute as a whole and to its object and policy.  Dada v. Mukasey,
554 U. S. 1, ___ (2008) (slip op., at 13) (quoting Gozlon-Peretz v. United States,
498 U. S. 395,
407 (1991)
). Both statutes were enacted to reflect principles set forth in international agreements, but the principles differ in significant respects.

As discussed, Congress enacted the DPA in 1948 as part of an international effort to address individuals who were forced to leave their homelands during and after the second World War. Fedorenko, supra, at 495. The DPA excludes those who voluntarily assisted the enemy forces since the outbreak of the second world war,
62Stat.
3052, as well as all who assisted the enemy in persecuting civil populations of countries, id., at 3051. The latter exclusion clause makes no reference to culpability. The exclusion of even those involved in nonculpable, involuntary assistance in Nazi persecution, as an expert testified in Fedorenko, may be  [b]ecause the crime against humanity that is involved in the concentration camp puts it into a different category.  449 U. S., at 511, n. 32.

The persecutor bar in this case, by contrast, was enacted as part of the Refugee Act of 1980. Unlike the DPA, which was enacted to address not just the post war refugee problem but also the Holocaust and its horror, the Refugee Act was designed to provide a general rule for the ongoing treatment of all refugees and displaced persons. As this Court has twice recognized,  one of Congress primary purposes in passing the Refugee Act was to implement the principles agreed to in the 1967 United Nations Protocol Relating to the Status of Refugees, Jan. 31, 1967, 19 U. S. T. 6224, T. I. A. S. 6577 (1968), as well as the United Nations Convention Relating to the Status of Refugees, 189 U. N. T. S. 150 (July 28, 1951), reprinted in 19 U. S. T. 6259. Aguirre-Aguirre, 526 U. S., at 427 (quoting Cardoza-Fonseca, 480 U. S., at 436437).

These authorities illustrate why Fedorenko, which addressed a different statute enacted for a different purpose, does not control the BIAs interpretation of this persecutor bar. Whatever weight or relevance these various authorities may have in interpreting the statute should be considered by the agency in the first instance, and by any subsequent reviewing court, after our remand.

C

The Government argues that if there were any ambiguity in the text, the Boards determination that the bar contains no such exception is reasonable and thus controlling. Brief for Respondent 11. Whether such an interpretation would be reasonable, and thus owed Chevron deference, is a legitimate question; but it is not now before us. The BIA deemed its interpretation to be mandated by Fedorenko, and that error prevented it from a full consideration of the statutory question here presented.

In denying relief in this case the BIA recited a rule that has developed in its own case law in reliance on Fedorenko: [A]n aliens motivation and intent are irrelevant to the issue of whether he assisted in persecution . . . [I]t is the objective effect of an aliens actions which is controlling. App. to Pet. for Cert. 6a. The rule is based on three earlier decisions: Matter of Laipenieks, 18 I. & N. Dec. 433 (1983); Matter of Fedorenko, 19 I. & N. Dec. 57; and Matter of Rodriguez-Majano, 19 I. & N. Dec. 811 (1988).

In Matter of Laipenieks, the BIA applied the Courts Fedorenko analysis of the DPA to a different postwar statute, which provided for the deportation of anyone associated with the Nazis who ordered, incited, assisted, or otherwise participated in persecution based on a protected ground.
8 U. S. C. §1182(a)(3)(E)(i). Finding no agency or judicial decision on point, the BIA relied on Fedorenko. It recognized that the unique structure of the Fedorenko statute was not present in §1182(a)(3)(E)(i), but the BIA nevertheless adopted wholesale the Fedorenko rule: [A]s in Fedorenko, . . . the plain language of [§1182(a)(3)(E)(i)] mandates a literal interpretation, and the omission of an intent element compels the conclusion that [§1182(a)(3)(E)(i)] makes all those who assisted in the specific persecution deportable. 18 I. & N. Dec., at 464. In other words, particular motivations or intent . . . is not a relevant factor. Ibid.

The second decision, Matter of Fedorenko, also dealt with §1182(a)(3)(E)(i), and it involved the same alien whose citizenship was revoked by this Courts Fedorenko decision. This time the agency sought to deport him. Fedorenko responded by requesting suspension of deportation. He argued that, unlike the DPAs bar on any assistancevoluntary or involuntaryin persecution, see Fedorenko, 449 U. S., at 512, the text and structure of §1182(a)(3)(E)(i) required deportation only of those who voluntarily assisted in persecuting others. The BIA rejected that distinction, noting that it was foreclosed by Matter of Laipenieks: It may be, as [Fedorenko] argues, that his service at Treblinka was involuntary. . . . We need not resolve the issue, however, because as a matter of law [Fedorenkos] motivations for serving as a guard at Treblinka are immaterial to the question of his deportability under §1182(a)(3)(E)(i). 19 I. & N. Dec., at 6970.

Later, the BIA applied this Courts Fedorenko rule to the persecutor bar that is at issue in the present case. In Matter of Rodriguez-Majano, the BIA granted relief because the aliens coerced conduct as a guerrilla was not persecution based on a protected ground. 19 I. & N. Dec., at 815816. Nevertheless, in reaching its conclusion the BIA incorporated without additional analysis the Fedorenko rule as applied in Matter of Laipenieks and reiterated in Matter of Fedorenko. 19 I. & N. Dec., at 814815. The BIA reaffirmed that [t]he participation or assistance of an alien in persecution need not be of his own volition to bar him from relief. Id., at 814 (citing Fedorenko,
449 U. S. 490).

Our reading of these decisions confirms that the BIA has not exercised its interpretive authority but, instead, has determined that Fedorenko controls. This mistaken assumption stems from a failure to recognize the inapplicability of the principle of statutory construction invoked in Fedorenko, as well as a failure to appreciate the differences in statutory purpose. The BIA is not bound to apply the Fedorenko rule that motive and intent are irrelevant to the persecutor bar at issue in this case. Whether the statute permits such an interpretation based on a different course of reasoning must be determined in the first instance by the agency.

Justice Stevens would have the Court provide a definite answer to the question presented and then remand for further proceedings. That approach, however, is in tension with the ordinary remand rule. Ventura, supra, at 18; see also Cajun Elec. Power Cooperative, Inc. v. FERC, 924 F. 2d 1132, 1136 (CADC 1991) (opinion for the Court by Silberman, J., joined by R. Ginsburg and Thomas, JJ.) ([I]f an agency erroneously contends that Congress intent has been clearly expressed and has rested on that ground, we remand to require the agency to consider the question afresh in light of the ambiguity we see). Thomas is illustrative. There, the agency had not determined whether a family may constitute a social group for the purposes of refugee status. The Ninth Circuit held that the family can constitute a protected social group and that the particular family at issue did qualify. 547 U. S., at 184185. The Solicitor General sought review in this Court on whether the Ninth Circuit erred in holding, in the first instance and without prior resolution of the questions by the relevant administrative agency, that members of a family can and do constitute a particular social group, within the meaning of the Act. Id., at 185 (internal quotation marks omitted). He argued that the Ninth Circuits decision violated the Ventura ordinary remand rule. We agreed and summarily reversed. 547 U. S., at 184185

Ventura and Thomas counsel a similar result here. Because of the important differences between the statute before us and the one at issue in Fedorenko, we find it appropriate to remand to the agency for its initial determination of the statutory interpretation question and its application to this case. The agencys interpretation of the statutory meaning of persecution may be explained by a more comprehensive definition, one designed to elaborate on the term in anticipation of a wide range of potential conduct; and that expanded definition in turn may be influenced by how practical, or impractical, the standard would be in terms of its application to specific cases. These matters may have relevance in determining whether its statutory interpretation is a permissible one.

As the Court said in Ventura and reiterated in Thomas,  [t]he agency can bring its expertise to bear upon the matter; it can evaluate the evidence; it can make an initial determination; and, in doing so, it can, through informed discussion and analysis, help a court later determine whether its decision exceeds the leeway that the law provides.  547 U. S., at 186187 (quoting Ventura, supra, at 17). If the BIA decides to adopt a standard that considers voluntariness to some degree, it may be prudent and necessary for the Immigration Judge to conduct additional factfinding based on the new standard. Those determinations are for the agency to make in the first instance.

***

We reverse the judgment of the Court of Appeals and remand the case for further proceedings consistent with this opinion.

on writ of certiorari to the united states court ofappeals for the fifth circuit

[March 3, 2009]

Justice Kennedy delivered the opinion of the Court.

An alien who fears persecution in his homeland and seeks refugee status in this country is barred from obtaining that relief if he has persecuted others.

The term refugee does not include any person who ordered, incited, assisted, or otherwise participated in the persecution of any person on account of race, religion, nationality, membership in a particular social group, or political opinion. Immigration and Nationality Act (INA), §101,
66Stat.
166, as added by Refugee Act of 1980, §201(a),
94Stat.
102103,
8 U. S. C. §1101(a)(42).

In this case the Board of Immigration Appeals (BIA) determined that the persecutor bar applies even if the aliens assistance in persecution was coerced or otherwise the product of duress. In so ruling the BIA followed its earlier decisions that found Fedorenko v. United States,
449 U. S. 490 (1981)
, controlling. The Court of Appeals for the Fifth Circuit, in affirming the agency, relied on its precedent following the same reasoning. We hold that the BIA and the Court of Appeals misapplied Fedorenko. We reverse and remand for the agency to interpret the statute, free from the error, in the first instance.

I

Petitioner in this Court is Daniel Girmai Negusie, a dual national of Eritrea and Ethiopia, his father having been a national of the former and his mother of the latter. Born and educated in Ethiopia, he left there for Eritrea around the age of 18 to see his mother and find employment. The year was 1994. After a few months in Eritrea, state officials took custody of petitioner and others when they were attending a movie. He was forced to perform hard labor for a month and then was conscripted into the military for a time. War broke out between Ethiopia and Eritrea in 1998, and he was conscripted again.

When petitioner refused to fight against Ethiopia, his other homeland, the Eritrean Government incarcerated him. Prison guards punished petitioner by beating him with sticks and placing him in the hot sun. He was released after two years and forced to work as a prison guard, a duty he performed on a rotating basis for about four years. It is undisputed that the prisoners he guarded were being persecuted on account of a protected groundi.e., race, religion, nationality, membership in a particular social group, or political opinion.
8 U. S. C. §1101(a)(42). Petitioner testified that he carried a gun, guarded the gate to prevent escape, and kept prisoners from taking showers and obtaining fresh air. He also guarded prisoners to make sure they stayed in the sun, which he knew was a form of punishment. He saw at least one man die after being in the sun for more than two hours. Petitioner testified that he had not shot at or directly punished any prisoner and that he helped prisoners on various occasions. Petitioner escaped from the prison and hid in a container, which was loaded on board a ship heading to the United States. Once here he applied for asylum and withholding of removal.

In a careful opinion the Immigration Judge, W. Wayne Stogner, found that petitioners testimony, for the most part, was credible. He concluded that petitioner assisted in persecution by working as an armed guard. The judge determined that although theres no evidence to establish that [petitioner] is a malicious person or that he was an aggressive person who mistreated the prisoners, . . . the very fact that he helped [the government] in the prison compound where he had reason to know that they were persecuted constitutes assisting in the persecution of others and bars [petitioner] from obtaining asylum or withholding of removal. App. to Pet. for Cert. 16a17a (citing, inter alia, Fedorenko, supra). The judge, however, granted deferral of removal under CAT because petitioner was likely to be tortured if returned to Eritrea.

The BIA affirmed the denial of asylum and withholding. It noted petitioners role as an armed guard in a facility where prisoners were tortured and left to die out in the sun . . . on account of a protected ground. App. to Pet. for Cert. 6a. The BIA held that [t]he fact that [petitioner] was compelled to participate as a prison guard, and may not have actively tortured or mistreated anyone, is immaterial. Ibid. That is because  an aliens motivation and intent are irrelevant to the issue of whether he assisted in persecution . . . [I]t is the objective effect of an aliens actions which is controlling.  Ibid. (quoting Matter of Fedorenko, 19 I. & N. Dec. 57, 69 (BIA 1984)). The BIA also affirmed the grant of deferral of removal under CAT.

On petition for review the Court of Appeals agreed with the BIA that whether an alien is compelled to assist in persecution is immaterial for persecutor-bar purposes. App. to Pet. for Cert. 2a (citing Fedorenko, 449 U. S., at 512, n. 34). We granted certiorari. 552 U. S. ___ (2008).

II

Consistent with the rule in Chevron U. S. A. Inc. v. Natural Resources Defense Council, Inc.,
467 U. S. 837,
842843 (1984)
, the BIA is entitled to deference in interpreting ambiguous provisions of the INA. The question here is whether an alien who was compelled to assist in persecution can be eligible for asylum or withholding of removal. We conclude that the BIA misapplied our precedent in Fedorenko as mandating that an aliens motivation and intent are irrelevant to the issue whether an alien assisted in persecution. The agency must confront the same question free of this mistaken legal premise.

A

It is well settled that principles of Chevron deference are applicable to this statutory scheme. INS v. Aguirre-Aguirre,
526 U. S. 415,
424 (1999)
. Congress has charged the Attorney General with administering the INA, and a ruling by the Attorney General with respect to all questions of law shall be controlling.
8 U. S. C. §1103(a)(1). Judicial deference in the immigration context is of special importance, for executive officials exercise especially sensitive political functions that implicate questions of foreign relations. INS v. Abudu,
485 U. S. 94,
100 (1988)
. The Attorney Generals decision to bar an alien who has participated in persecution may affect our relations with [the aliens native] country or its neighbors. The judiciary is not well positioned to shoulder primary responsibility for assessing the likelihood and importance of such diplomatic repercussions. Aguirre-Aguirre, 526 U. S., at 425.

The Attorney General, in turn, has delegated to the BIA the  discretion and authority conferred upon the Attorney General by law  in the course of  considering and determining cases before it.  Ibid. (quoting
8 CFR §3.1(d)(1) (1998)). As a consequence, the BIA should be accorded Chevron deference as it gives ambiguous statutory terms concrete meaning through a process of case-by-case adjudication.  Aguirre-Aguirre, supra, at 425 (quoting INS v. Cardoza-Fonseca,
480 U. S. 421,
448449 (1987)
). When the BIA has not spoken on a matter that statutes place primarily in agency hands, our ordinary rule is to remand to giv[e] the BIA the opportunity to address the matter in the first instance in light of its own experience. INS v. Orlando Ventura,
537 U. S. 12,
1617 (2002)
(per curiam).

B

The parties disagree over whether coercion or duress is relevant in determining if an alien assisted or otherwise participated in persecution. As there is substance to both contentions, we conclude that the statute has an ambiguity that the agency should address in the first instance.

Petitioner argues that the statutes plain language makes clear that involuntary acts do not implicate the persecutor bar because  persecution  presumes moral blameworthiness. Brief for Petitioner 2328. He invokes principles of criminal culpability, concepts of international law, and the rule of lenity. Id., at 2845. Those arguments may be persuasive in determining whether a particular agency interpretation is reasonable, but they do not demonstrate that the statute is unambiguous. Petitioner all but conceded as much at argument in this Court when he indicated that the BIA has discretion to construe the duress defense in either a narrow or a broad way. Tr. of Oral Arg. 2024.

The Government, on the other hand, asserts that the statute does not allow petitioners construction. The statutory text, the Government says, directly answers that question: there is no exception for conduct that is coerced because Congress did not include one. Brief for Respondent 11. We disagree. The silence is not conclusive. The question is whether the statutory text mandates that coerced actions must be deemed assistance in persecution. On that point the statute, in its precise terms, is not explicit. Nor is this a case where it is clear that Congress had an intention on the precise question at issue. Cf. Cardoza-Fonseca, supra, at 448449.

The Government, like the BIA and the Court of Appeals, relies on Fedorenko to provide the answer. This reliance is not without some basis, as the Court there held that voluntariness was not required with respect to another persecutor bar. 449 U. S., at 512. To the extent, however, the Government deems Fedorenko to be controlling, it is in error.

In Fedorenko, the Court interpreted the Displaced Persons Act of 1948 (DPA),
62Stat.
1009. The DPA was enacted to enable European refugees driven from their homelands by the [second world] war to emigrate to the United States without regard to traditional immigration quotas. 449 U. S., at 495. Section 2(b) of the DPA provides relief to any displaced person or refugee as defined in Annex I of the Constitution of the International Refugee Organization of the United Nations (IRO Constitution).
62Stat.
1009. The IRO Constitution, as codified by Congress, excludes any individual who can be shown: (a) to have assisted the enemy in persecuting civil populations of countries, Members of the United Nations; or (b) to have voluntarily assisted the enemy forces since the outbreak of the second world war in their operations against the United Nations. Annex I, Part II, §2,
62Stat.
30513052.

The Fedorenko Court held that an individuals service as a concentration camp armed guardwhether voluntary or involuntarymade him ineligible for a visa under §2(a) of the IRO Constitution. 449 U. S., at 512. That Congress did not adopt a voluntariness requirement for §2(a), the Court noted, is plain from comparing §2(a) with §2(b), which excludes only those individuals who voluntarily assisted the enemy forces.  Ibid. The Court relied on the principle of statutory construction that the deliberate omission of the word voluntary from §2(a) compels the conclusion that the statute made all those who assisted in persecution of civilians ineligible for visas. Ibid.

Fedorenko does not compel the same conclusion in the case now before us. The textual structure of the statute in Fedorenko (voluntary is in one subsection but not the other) is not part of the statutory framework considered here. Congress did not use the word voluntary in any subsection of the persecutor bar, so its omission cannot carry the same significance.

The difference between the statutory scheme in Fedorenko and the one here is confirmed when we  look not only to the particular statutory language, but to the design of the statute as a whole and to its object and policy.  Dada v. Mukasey,
554 U. S. 1, ___ (2008) (slip op., at 13) (quoting Gozlon-Peretz v. United States,
498 U. S. 395,
407 (1991)
). Both statutes were enacted to reflect principles set forth in international agreements, but the principles differ in significant respects.

As discussed, Congress enacted the DPA in 1948 as part of an international effort to address individuals who were forced to leave their homelands during and after the second World War. Fedorenko, supra, at 495. The DPA excludes those who voluntarily assisted the enemy forces since the outbreak of the second world war,
62Stat.
3052, as well as all who assisted the enemy in persecuting civil populations of countries, id., at 3051. The latter exclusion clause makes no reference to culpability. The exclusion of even those involved in nonculpable, involuntary assistance in Nazi persecution, as an expert testified in Fedorenko, may be  [b]ecause the crime against humanity that is involved in the concentration camp puts it into a different category.  449 U. S., at 511, n. 32.

The persecutor bar in this case, by contrast, was enacted as part of the Refugee Act of 1980. Unlike the DPA, which was enacted to address not just the post war refugee problem but also the Holocaust and its horror, the Refugee Act was designed to provide a general rule for the ongoing treatment of all refugees and displaced persons. As this Court has twice recognized,  one of Congress primary purposes in passing the Refugee Act was to implement the principles agreed to in the 1967 United Nations Protocol Relating to the Status of Refugees, Jan. 31, 1967, 19 U. S. T. 6224, T. I. A. S. 6577 (1968), as well as the United Nations Convention Relating to the Status of Refugees, 189 U. N. T. S. 150 (July 28, 1951), reprinted in 19 U. S. T. 6259. Aguirre-Aguirre, 526 U. S., at 427 (quoting Cardoza-Fonseca, 480 U. S., at 436437).

These authorities illustrate why Fedorenko, which addressed a different statute enacted for a different purpose, does not control the BIAs interpretation of this persecutor bar. Whatever weight or relevance these various authorities may have in interpreting the statute should be considered by the agency in the first instance, and by any subsequent reviewing court, after our remand.

C

The Government argues that if there were any ambiguity in the text, the Boards determination that the bar contains no such exception is reasonable and thus controlling. Brief for Respondent 11. Whether such an interpretation would be reasonable, and thus owed Chevron deference, is a legitimate question; but it is not now before us. The BIA deemed its interpretation to be mandated by Fedorenko, and that error prevented it from a full consideration of the statutory question here presented.

In denying relief in this case the BIA recited a rule that has developed in its own case law in reliance on Fedorenko: [A]n aliens motivation and intent are irrelevant to the issue of whether he assisted in persecution . . . [I]t is the objective effect of an aliens actions which is controlling. App. to Pet. for Cert. 6a. The rule is based on three earlier decisions: Matter of Laipenieks, 18 I. & N. Dec. 433 (1983); Matter of Fedorenko, 19 I. & N. Dec. 57; and Matter of Rodriguez-Majano, 19 I. & N. Dec. 811 (1988).

In Matter of Laipenieks, the BIA applied the Courts Fedorenko analysis of the DPA to a different postwar statute, which provided for the deportation of anyone associated with the Nazis who ordered, incited, assisted, or otherwise participated in persecution based on a protected ground.
8 U. S. C. §1182(a)(3)(E)(i). Finding no agency or judicial decision on point, the BIA relied on Fedorenko. It recognized that the unique structure of the Fedorenko statute was not present in §1182(a)(3)(E)(i), but the BIA nevertheless adopted wholesale the Fedorenko rule: [A]s in Fedorenko, . . . the plain language of [§1182(a)(3)(E)(i)] mandates a literal interpretation, and the omission of an intent element compels the conclusion that [§1182(a)(3)(E)(i)] makes all those who assisted in the specific persecution deportable. 18 I. & N. Dec., at 464. In other words, particular motivations or intent . . . is not a relevant factor. Ibid.

The second decision, Matter of Fedorenko, also dealt with §1182(a)(3)(E)(i), and it involved the same alien whose citizenship was revoked by this Courts Fedorenko decision. This time the agency sought to deport him. Fedorenko responded by requesting suspension of deportation. He argued that, unlike the DPAs bar on any assistancevoluntary or involuntaryin persecution, see Fedorenko, 449 U. S., at 512, the text and structure of §1182(a)(3)(E)(i) required deportation only of those who voluntarily assisted in persecuting others. The BIA rejected that distinction, noting that it was foreclosed by Matter of Laipenieks: It may be, as [Fedorenko] argues, that his service at Treblinka was involuntary. . . . We need not resolve the issue, however, because as a matter of law [Fedorenkos] motivations for serving as a guard at Treblinka are immaterial to the question of his deportability under §1182(a)(3)(E)(i). 19 I. & N. Dec., at 6970.

Later, the BIA applied this Courts Fedorenko rule to the persecutor bar that is at issue in the present case. In Matter of Rodriguez-Majano, the BIA granted relief because the aliens coerced conduct as a guerrilla was not persecution based on a protected ground. 19 I. & N. Dec., at 815816. Nevertheless, in reaching its conclusion the BIA incorporated without additional analysis the Fedorenko rule as applied in Matter of Laipenieks and reiterated in Matter of Fedorenko. 19 I. & N. Dec., at 814815. The BIA reaffirmed that [t]he participation or assistance of an alien in persecution need not be of his own volition to bar him from relief. Id., at 814 (citing Fedorenko,
449 U. S. 490).

Our reading of these decisions confirms that the BIA has not exercised its interpretive authority but, instead, has determined that Fedorenko controls. This mistaken assumption stems from a failure to recognize the inapplicability of the principle of statutory construction invoked in Fedorenko, as well as a failure to appreciate the differences in statutory purpose. The BIA is not bound to apply the Fedorenko rule that motive and intent are irrelevant to the persecutor bar at issue in this case. Whether the statute permits such an interpretation based on a different course of reasoning must be determined in the first instance by the agency.

Justice Stevens would have the Court provide a definite answer to the question presented and then remand for further proceedings. That approach, however, is in tension with the ordinary remand rule. Ventura, supra, at 18; see also Cajun Elec. Power Cooperative, Inc. v. FERC, 924 F. 2d 1132, 1136 (CADC 1991) (opinion for the Court by Silberman, J., joined by R. Ginsburg and Thomas, JJ.) ([I]f an agency erroneously contends that Congress intent has been clearly expressed and has rested on that ground, we remand to require the agency to consider the question afresh in light of the ambiguity we see). Thomas is illustrative. There, the agency had not determined whether a family may constitute a social group for the purposes of refugee status. The Ninth Circuit held that the family can constitute a protected social group and that the particular family at issue did qualify. 547 U. S., at 184185. The Solicitor General sought review in this Court on whether the Ninth Circuit erred in holding, in the first instance and without prior resolution of the questions by the relevant administrative agency, that members of a family can and do constitute a particular social group, within the meaning of the Act. Id., at 185 (internal quotation marks omitted). He argued that the Ninth Circuits decision violated the Ventura ordinary remand rule. We agreed and summarily reversed. 547 U. S., at 184185

Ventura and Thomas counsel a similar result here. Because of the important differences between the statute before us and the one at issue in Fedorenko, we find it appropriate to remand to the agency for its initial determination of the statutory interpretation question and its application to this case. The agencys interpretation of the statutory meaning of persecution may be explained by a more comprehensive definition, one designed to elaborate on the term in anticipation of a wide range of potential conduct; and that expanded definition in turn may be influenced by how practical, or impractical, the standard would be in terms of its application to specific cases. These matters may have relevance in determining whether its statutory interpretation is a permissible one.

As the Court said in Ventura and reiterated in Thomas,  [t]he agency can bring its expertise to bear upon the matter; it can evaluate the evidence; it can make an initial determination; and, in doing so, it can, through informed discussion and analysis, help a court later determine whether its decision exceeds the leeway that the law provides.  547 U. S., at 186187 (quoting Ventura, supra, at 17). If the BIA decides to adopt a standard that considers voluntariness to some degree, it may be prudent and necessary for the Immigration Judge to conduct additional factfinding based on the new standard. Those determinations are for the agency to make in the first instance.

***

We reverse the judgment of the Court of Appeals and remand the case for further proceedings consistent with this opinion.

on writ of certiorari to the united states court ofappeals for the fifth circuit

[March 3, 2009]

Justice Kennedy delivered the opinion of the Court.

An alien who fears persecution in his homeland and seeks refugee status in this country is barred from obtaining that relief if he has persecuted others.

The term refugee does not include any person who ordered, incited, assisted, or otherwise participated in the persecution of any person on account of race, religion, nationality, membership in a particular social group, or political opinion. Immigration and Nationality Act (INA), §101,
66Stat.
166, as added by Refugee Act of 1980, §201(a),
94Stat.
102103,
8 U. S. C. §1101(a)(42).

In this case the Board of Immigration Appeals (BIA) determined that the persecutor bar applies even if the aliens assistance in persecution was coerced or otherwise the product of duress. In so ruling the BIA followed its earlier decisions that found Fedorenko v. United States,
449 U. S. 490 (1981)
, controlling. The Court of Appeals for the Fifth Circuit, in affirming the agency, relied on its precedent following the same reasoning. We hold that the BIA and the Court of Appeals misapplied Fedorenko. We reverse and remand for the agency to interpret the statute, free from the error, in the first instance.

I

Petitioner in this Court is Daniel Girmai Negusie, a dual national of Eritrea and Ethiopia, his father having been a national of the former and his mother of the latter. Born and educated in Ethiopia, he left there for Eritrea around the age of 18 to see his mother and find employment. The year was 1994. After a few months in Eritrea, state officials took custody of petitioner and others when they were attending a movie. He was forced to perform hard labor for a month and then was conscripted into the military for a time. War broke out between Ethiopia and Eritrea in 1998, and he was conscripted again.

When petitioner refused to fight against Ethiopia, his other homeland, the Eritrean Government incarcerated him. Prison guards punished petitioner by beating him with sticks and placing him in the hot sun. He was released after two years and forced to work as a prison guard, a duty he performed on a rotating basis for about four years. It is undisputed that the prisoners he guarded were being persecuted on account of a protected groundi.e., race, religion, nationality, membership in a particular social group, or political opinion.
8 U. S. C. §1101(a)(42). Petitioner testified that he carried a gun, guarded the gate to prevent escape, and kept prisoners from taking showers and obtaining fresh air. He also guarded prisoners to make sure they stayed in the sun, which he knew was a form of punishment. He saw at least one man die after being in the sun for more than two hours. Petitioner testified that he had not shot at or directly punished any prisoner and that he helped prisoners on various occasions. Petitioner escaped from the prison and hid in a container, which was loaded on board a ship heading to the United States. Once here he applied for asylum and withholding of removal.

In a careful opinion the Immigration Judge, W. Wayne Stogner, found that petitioners testimony, for the most part, was credible. He concluded that petitioner assisted in persecution by working as an armed guard. The judge determined that although theres no evidence to establish that [petitioner] is a malicious person or that he was an aggressive person who mistreated the prisoners, . . . the very fact that he helped [the government] in the prison compound where he had reason to know that they were persecuted constitutes assisting in the persecution of others and bars [petitioner] from obtaining asylum or withholding of removal. App. to Pet. for Cert. 16a17a (citing, inter alia, Fedorenko, supra). The judge, however, granted deferral of removal under CAT because petitioner was likely to be tortured if returned to Eritrea.

The BIA affirmed the denial of asylum and withholding. It noted petitioners role as an armed guard in a facility where prisoners were tortured and left to die out in the sun . . . on account of a protected ground. App. to Pet. for Cert. 6a. The BIA held that [t]he fact that [petitioner] was compelled to participate as a prison guard, and may not have actively tortured or mistreated anyone, is immaterial. Ibid. That is because  an aliens motivation and intent are irrelevant to the issue of whether he assisted in persecution . . . [I]t is the objective effect of an aliens actions which is controlling.  Ibid. (quoting Matter of Fedorenko, 19 I. & N. Dec. 57, 69 (BIA 1984)). The BIA also affirmed the grant of deferral of removal under CAT.

On petition for review the Court of Appeals agreed with the BIA that whether an alien is compelled to assist in persecution is immaterial for persecutor-bar purposes. App. to Pet. for Cert. 2a (citing Fedorenko, 449 U. S., at 512, n. 34). We granted certiorari. 552 U. S. ___ (2008).

II

Consistent with the rule in Chevron U. S. A. Inc. v. Natural Resources Defense Council, Inc.,
467 U. S. 837,
842843 (1984)
, the BIA is entitled to deference in interpreting ambiguous provisions of the INA. The question here is whether an alien who was compelled to assist in persecution can be eligible for asylum or withholding of removal. We conclude that the BIA misapplied our precedent in Fedorenko as mandating that an aliens motivation and intent are irrelevant to the issue whether an alien assisted in persecution. The agency must confront the same question free of this mistaken legal premise.

A

It is well settled that principles of Chevron deference are applicable to this statutory scheme. INS v. Aguirre-Aguirre,
526 U. S. 415,
424 (1999)
. Congress has charged the Attorney General with administering the INA, and a ruling by the Attorney General with respect to all questions of law shall be controlling.
8 U. S. C. §1103(a)(1). Judicial deference in the immigration context is of special importance, for executive officials exercise especially sensitive political functions that implicate questions of foreign relations. INS v. Abudu,
485 U. S. 94,
100 (1988)
. The Attorney Generals decision to bar an alien who has participated in persecution may affect our relations with [the aliens native] country or its neighbors. The judiciary is not well positioned to shoulder primary responsibility for assessing the likelihood and importance of such diplomatic repercussions. Aguirre-Aguirre, 526 U. S., at 425.

The Attorney General, in turn, has delegated to the BIA the  discretion and authority conferred upon the Attorney General by law  in the course of  considering and determining cases before it.  Ibid. (quoting
8 CFR §3.1(d)(1) (1998)). As a consequence, the BIA should be accorded Chevron deference as it gives ambiguous statutory terms concrete meaning through a process of case-by-case adjudication.  Aguirre-Aguirre, supra, at 425 (quoting INS v. Cardoza-Fonseca,
480 U. S. 421,
448449 (1987)
). When the BIA has not spoken on a matter that statutes place primarily in agency hands, our ordinary rule is to remand to giv[e] the BIA the opportunity to address the matter in the first instance in light of its own experience. INS v. Orlando Ventura,
537 U. S. 12,
1617 (2002)
(per curiam).

B

The parties disagree over whether coercion or duress is relevant in determining if an alien assisted or otherwise participated in persecution. As there is substance to both contentions, we conclude that the statute has an ambiguity that the agency should address in the first instance.

Petitioner argues that the statutes plain language makes clear that involuntary acts do not implicate the persecutor bar because  persecution  presumes moral blameworthiness. Brief for Petitioner 2328. He invokes principles of criminal culpability, concepts of international law, and the rule of lenity. Id., at 2845. Those arguments may be persuasive in determining whether a particular agency interpretation is reasonable, but they do not demonstrate that the statute is unambiguous. Petitioner all but conceded as much at argument in this Court when he indicated that the BIA has discretion to construe the duress defense in either a narrow or a broad way. Tr. of Oral Arg. 2024.

The Government, on the other hand, asserts that the statute does not allow petitioners construction. The statutory text, the Government says, directly answers that question: there is no exception for conduct that is coerced because Congress did not include one. Brief for Respondent 11. We disagree. The silence is not conclusive. The question is whether the statutory text mandates that coerced actions must be deemed assistance in persecution. On that point the statute, in its precise terms, is not explicit. Nor is this a case where it is clear that Congress had an intention on the precise question at issue. Cf. Cardoza-Fonseca, supra, at 448449.

The Government, like the BIA and the Court of Appeals, relies on Fedorenko to provide the answer. This reliance is not without some basis, as the Court there held that voluntariness was not required with respect to another persecutor bar. 449 U. S., at 512. To the extent, however, the Government deems Fedorenko to be controlling, it is in error.

In Fedorenko, the Court interpreted the Displaced Persons Act of 1948 (DPA),
62Stat.
1009. The DPA was enacted to enable European refugees driven from their homelands by the [second world] war to emigrate to the United States without regard to traditional immigration quotas. 449 U. S., at 495. Section 2(b) of the DPA provides relief to any displaced person or refugee as defined in Annex I of the Constitution of the International Refugee Organization of the United Nations (IRO Constitution).
62Stat.
1009. The IRO Constitution, as codified by Congress, excludes any individual who can be shown: (a) to have assisted the enemy in persecuting civil populations of countries, Members of the United Nations; or (b) to have voluntarily assisted the enemy forces since the outbreak of the second world war in their operations against the United Nations. Annex I, Part II, §2,
62Stat.
30513052.

The Fedorenko Court held that an individuals service as a concentration camp armed guardwhether voluntary or involuntarymade him ineligible for a visa under §2(a) of the IRO Constitution. 449 U. S., at 512. That Congress did not adopt a voluntariness requirement for §2(a), the Court noted, is plain from comparing §2(a) with §2(b), which excludes only those individuals who voluntarily assisted the enemy forces.  Ibid. The Court relied on the principle of statutory construction that the deliberate omission of the word voluntary from §2(a) compels the conclusion that the statute made all those who assisted in persecution of civilians ineligible for visas. Ibid.

Fedorenko does not compel the same conclusion in the case now before us. The textual structure of the statute in Fedorenko (voluntary is in one subsection but not the other) is not part of the statutory framework considered here. Congress did not use the word voluntary in any subsection of the persecutor bar, so its omission cannot carry the same significance.

The difference between the statutory scheme in Fedorenko and the one here is confirmed when we  look not only to the particular statutory language, but to the design of the statute as a whole and to its object and policy.  Dada v. Mukasey,
554 U. S. 1, ___ (2008) (slip op., at 13) (quoting Gozlon-Peretz v. United States,
498 U. S. 395,
407 (1991)
). Both statutes were enacted to reflect principles set forth in international agreements, but the principles differ in significant respects.

As discussed, Congress enacted the DPA in 1948 as part of an international effort to address individuals who were forced to leave their homelands during and after the second World War. Fedorenko, supra, at 495. The DPA excludes those who voluntarily assisted the enemy forces since the outbreak of the second world war,
62Stat.
3052, as well as all who assisted the enemy in persecuting civil populations of countries, id., at 3051. The latter exclusion clause makes no reference to culpability. The exclusion of even those involved in nonculpable, involuntary assistance in Nazi persecution, as an expert testified in Fedorenko, may be  [b]ecause the crime against humanity that is involved in the concentration camp puts it into a different category.  449 U. S., at 511, n. 32.

The persecutor bar in this case, by contrast, was enacted as part of the Refugee Act of 1980. Unlike the DPA, which was enacted to address not just the post war refugee problem but also the Holocaust and its horror, the Refugee Act was designed to provide a general rule for the ongoing treatment of all refugees and displaced persons. As this Court has twice recognized,  one of Congress primary purposes in passing the Refugee Act was to implement the principles agreed to in the 1967 United Nations Protocol Relating to the Status of Refugees, Jan. 31, 1967, 19 U. S. T. 6224, T. I. A. S. 6577 (1968), as well as the United Nations Convention Relating to the Status of Refugees, 189 U. N. T. S. 150 (July 28, 1951), reprinted in 19 U. S. T. 6259. Aguirre-Aguirre, 526 U. S., at 427 (quoting Cardoza-Fonseca, 480 U. S., at 436437).

These authorities illustrate why Fedorenko, which addressed a different statute enacted for a different purpose, does not control the BIAs interpretation of this persecutor bar. Whatever weight or relevance these various authorities may have in interpreting the statute should be considered by the agency in the first instance, and by any subsequent reviewing court, after our remand.

C

The Government argues that if there were any ambiguity in the text, the Boards determination that the bar contains no such exception is reasonable and thus controlling. Brief for Respondent 11. Whether such an interpretation would be reasonable, and thus owed Chevron deference, is a legitimate question; but it is not now before us. The BIA deemed its interpretation to be mandated by Fedorenko, and that error prevented it from a full consideration of the statutory question here presented.

In denying relief in this case the BIA recited a rule that has developed in its own case law in reliance on Fedorenko: [A]n aliens motivation and intent are irrelevant to the issue of whether he assisted in persecution . . . [I]t is the objective effect of an aliens actions which is controlling. App. to Pet. for Cert. 6a. The rule is based on three earlier decisions: Matter of Laipenieks, 18 I. & N. Dec. 433 (1983); Matter of Fedorenko, 19 I. & N. Dec. 57; and Matter of Rodriguez-Majano, 19 I. & N. Dec. 811 (1988).

In Matter of Laipenieks, the BIA applied the Courts Fedorenko analysis of the DPA to a different postwar statute, which provided for the deportation of anyone associated with the Nazis who ordered, incited, assisted, or otherwise participated in persecution based on a protected ground.
8 U. S. C. §1182(a)(3)(E)(i). Finding no agency or judicial decision on point, the BIA relied on Fedorenko. It recognized that the unique structure of the Fedorenko statute was not present in §1182(a)(3)(E)(i), but the BIA nevertheless adopted wholesale the Fedorenko rule: [A]s in Fedorenko, . . . the plain language of [§1182(a)(3)(E)(i)] mandates a literal interpretation, and the omission of an intent element compels the conclusion that [§1182(a)(3)(E)(i)] makes all those who assisted in the specific persecution deportable. 18 I. & N. Dec., at 464. In other words, particular motivations or intent . . . is not a relevant factor. Ibid.

The second decision, Matter of Fedorenko, also dealt with §1182(a)(3)(E)(i), and it involved the same alien whose citizenship was revoked by this Courts Fedorenko decision. This time the agency sought to deport him. Fedorenko responded by requesting suspension of deportation. He argued that, unlike the DPAs bar on any assistancevoluntary or involuntaryin persecution, see Fedorenko, 449 U. S., at 512, the text and structure of §1182(a)(3)(E)(i) required deportation only of those who voluntarily assisted in persecuting others. The BIA rejected that distinction, noting that it was foreclosed by Matter of Laipenieks: It may be, as [Fedorenko] argues, that his service at Treblinka was involuntary. . . . We need not resolve the issue, however, because as a matter of law [Fedorenkos] motivations for serving as a guard at Treblinka are immaterial to the question of his deportability under §1182(a)(3)(E)(i). 19 I. & N. Dec., at 6970.

Later, the BIA applied this Courts Fedorenko rule to the persecutor bar that is at issue in the present case. In Matter of Rodriguez-Majano, the BIA granted relief because the aliens coerced conduct as a guerrilla was not persecution based on a protected ground. 19 I. & N. Dec., at 815816. Nevertheless, in reaching its conclusion the BIA incorporated without additional analysis the Fedorenko rule as applied in Matter of Laipenieks and reiterated in Matter of Fedorenko. 19 I. & N. Dec., at 814815. The BIA reaffirmed that [t]he participation or assistance of an alien in persecution need not be of his own volition to bar him from relief. Id., at 814 (citing Fedorenko,
449 U. S. 490).

Our reading of these decisions confirms that the BIA has not exercised its interpretive authority but, instead, has determined that Fedorenko controls. This mistaken assumption stems from a failure to recognize the inapplicability of the principle of statutory construction invoked in Fedorenko, as well as a failure to appreciate the differences in statutory purpose. The BIA is not bound to apply the Fedorenko rule that motive and intent are irrelevant to the persecutor bar at issue in this case. Whether the statute permits such an interpretation based on a different course of reasoning must be determined in the first instance by the agency.

Justice Stevens would have the Court provide a definite answer to the question presented and then remand for further proceedings. That approach, however, is in tension with the ordinary remand rule. Ventura, supra, at 18; see also Cajun Elec. Power Cooperative, Inc. v. FERC, 924 F. 2d 1132, 1136 (CADC 1991) (opinion for the Court by Silberman, J., joined by R. Ginsburg and Thomas, JJ.) ([I]f an agency erroneously contends that Congress intent has been clearly expressed and has rested on that ground, we remand to require the agency to consider the question afresh in light of the ambiguity we see). Thomas is illustrative. There, the agency had not determined whether a family may constitute a social group for the purposes of refugee status. The Ninth Circuit held that the family can constitute a protected social group and that the particular family at issue did qualify. 547 U. S., at 184185. The Solicitor General sought review in this Court on whether the Ninth Circuit erred in holding, in the first instance and without prior resolution of the questions by the relevant administrative agency, that members of a family can and do constitute a particular social group, within the meaning of the Act. Id., at 185 (internal quotation marks omitted). He argued that the Ninth Circuits decision violated the Ventura ordinary remand rule. We agreed and summarily reversed. 547 U. S., at 184185

Ventura and Thomas counsel a similar result here. Because of the important differences between the statute before us and the one at issue in Fedorenko, we find it appropriate to remand to the agency for its initial determination of the statutory interpretation question and its application to this case. The agencys interpretation of the statutory meaning of persecution may be explained by a more comprehensive definition, one designed to elaborate on the term in anticipation of a wide range of potential conduct; and that expanded definition in turn may be influenced by how practical, or impractical, the standard would be in terms of its application to specific cases. These matters may have relevance in determining whether its statutory interpretation is a permissible one.

As the Court said in Ventura and reiterated in Thomas,  [t]he agency can bring its expertise to bear upon the matter; it can evaluate the evidence; it can make an initial determination; and, in doing so, it can, through informed discussion and analysis, help a court later determine whether its decision exceeds the leeway that the law provides.  547 U. S., at 186187 (quoting Ventura, supra, at 17). If the BIA decides to adopt a standard that considers voluntariness to some degree, it may be prudent and necessary for the Immigration Judge to conduct additional factfinding based on the new standard. Those determinations are for the agency to make in the first instance.

***

We reverse the judgment of the Court of Appeals and remand the case for further proceedings consistent with this opinion.

on writ of certiorari to the united states court ofappeals for the fifth circuit

[March 3, 2009]

Justice Kennedy delivered the opinion of the Court.

An alien who fears persecution in his homeland and seeks refugee status in this country is barred from obtaining that relief if he has persecuted others.

The term refugee does not include any person who ordered, incited, assisted, or otherwise participated in the persecution of any person on account of race, religion, nationality, membership in a particular social group, or political opinion. Immigration and Nationality Act (INA), §101,
66Stat.
166, as added by Refugee Act of 1980, §201(a),
94Stat.
102103,
8 U. S. C. §1101(a)(42).

In this case the Board of Immigration Appeals (BIA) determined that the persecutor bar applies even if the aliens assistance in persecution was coerced or otherwise the product of duress. In so ruling the BIA followed its earlier decisions that found Fedorenko v. United States,
449 U. S. 490 (1981)
, controlling. The Court of Appeals for the Fifth Circuit, in affirming the agency, relied on its precedent following the same reasoning. We hold that the BIA and the Court of Appeals misapplied Fedorenko. We reverse and remand for the agency to interpret the statute, free from the error, in the first instance.

I

Petitioner in this Court is Daniel Girmai Negusie, a dual national of Eritrea and Ethiopia, his father having been a national of the former and his mother of the latter. Born and educated in Ethiopia, he left there for Eritrea around the age of 18 to see his mother and find employment. The year was 1994. After a few months in Eritrea, state officials took custody of petitioner and others when they were attending a movie. He was forced to perform hard labor for a month and then was conscripted into the military for a time. War broke out between Ethiopia and Eritrea in 1998, and he was conscripted again.

When petitioner refused to fight against Ethiopia, his other homeland, the Eritrean Government incarcerated him. Prison guards punished petitioner by beating him with sticks and placing him in the hot sun. He was released after two years and forced to work as a prison guard, a duty he performed on a rotating basis for about four years. It is undisputed that the prisoners he guarded were being persecuted on account of a protected groundi.e., race, religion, nationality, membership in a particular social group, or political opinion.
8 U. S. C. §1101(a)(42). Petitioner testified that he carried a gun, guarded the gate to prevent escape, and kept prisoners from taking showers and obtaining fresh air. He also guarded prisoners to make sure they stayed in the sun, which he knew was a form of punishment. He saw at least one man die after being in the sun for more than two hours. Petitioner testified that he had not shot at or directly punished any prisoner and that he helped prisoners on various occasions. Petitioner escaped from the prison and hid in a container, which was loaded on board a ship heading to the United States. Once here he applied for asylum and withholding of removal.

In a careful opinion the Immigration Judge, W. Wayne Stogner, found that petitioners testimony, for the most part, was credible. He concluded that petitioner assisted in persecution by working as an armed guard. The judge determined that although theres no evidence to establish that [petitioner] is a malicious person or that he was an aggressive person who mistreated the prisoners, . . . the very fact that he helped [the government] in the prison compound where he had reason to know that they were persecuted constitutes assisting in the persecution of others and bars [petitioner] from obtaining asylum or withholding of removal. App. to Pet. for Cert. 16a17a (citing, inter alia, Fedorenko, supra). The judge, however, granted deferral of removal under CAT because petitioner was likely to be tortured if returned to Eritrea.

The BIA affirmed the denial of asylum and withholding. It noted petitioners role as an armed guard in a facility where prisoners were tortured and left to die out in the sun . . . on account of a protected ground. App. to Pet. for Cert. 6a. The BIA held that [t]he fact that [petitioner] was compelled to participate as a prison guard, and may not have actively tortured or mistreated anyone, is immaterial. Ibid. That is because  an aliens motivation and intent are irrelevant to the issue of whether he assisted in persecution . . . [I]t is the objective effect of an aliens actions which is controlling.  Ibid. (quoting Matter of Fedorenko, 19 I. & N. Dec. 57, 69 (BIA 1984)). The BIA also affirmed the grant of deferral of removal under CAT.

On petition for review the Court of Appeals agreed with the BIA that whether an alien is compelled to assist in persecution is immaterial for persecutor-bar purposes. App. to Pet. for Cert. 2a (citing Fedorenko, 449 U. S., at 512, n. 34). We granted certiorari. 552 U. S. ___ (2008).

II

Consistent with the rule in Chevron U. S. A. Inc. v. Natural Resources Defense Council, Inc.,
467 U. S. 837,
842843 (1984)
, the BIA is entitled to deference in interpreting ambiguous provisions of the INA. The question here is whether an alien who was compelled to assist in persecution can be eligible for asylum or withholding of removal. We conclude that the BIA misapplied our precedent in Fedorenko as mandating that an aliens motivation and intent are irrelevant to the issue whether an alien assisted in persecution. The agency must confront the same question free of this mistaken legal premise.

A

It is well settled that principles of Chevron deference are applicable to this statutory scheme. INS v. Aguirre-Aguirre,
526 U. S. 415,
424 (1999)
. Congress has charged the Attorney General with administering the INA, and a ruling by the Attorney General with respect to all questions of law shall be controlling.
8 U. S. C. §1103(a)(1). Judicial deference in the immigration context is of special importance, for executive officials exercise especially sensitive political functions that implicate questions of foreign relations. INS v. Abudu,
485 U. S. 94,
100 (1988)
. The Attorney Generals decision to bar an alien who has participated in persecution may affect our relations with [the aliens native] country or its neighbors. The judiciary is not well positioned to shoulder primary responsibility for assessing the likelihood and importance of such diplomatic repercussions. Aguirre-Aguirre, 526 U. S., at 425.

The Attorney General, in turn, has delegated to the BIA the  discretion and authority conferred upon the Attorney General by law  in the course of  considering and determining cases before it.  Ibid. (quoting
8 CFR §3.1(d)(1) (1998)). As a consequence, the BIA should be accorded Chevron deference as it gives ambiguous statutory terms concrete meaning through a process of case-by-case adjudication.  Aguirre-Aguirre, supra, at 425 (quoting INS v. Cardoza-Fonseca,
480 U. S. 421,
448449 (1987)
). When the BIA has not spoken on a matter that statutes place primarily in agency hands, our ordinary rule is to remand to giv[e] the BIA the opportunity to address the matter in the first instance in light of its own experience. INS v. Orlando Ventura,
537 U. S. 12,
1617 (2002)
(per curiam).

B

The parties disagree over whether coercion or duress is relevant in determining if an alien assisted or otherwise participated in persecution. As there is substance to both contentions, we conclude that the statute has an ambiguity that the agency should address in the first instance.

Petitioner argues that the statutes plain language makes clear that involuntary acts do not implicate the persecutor bar because  persecution  presumes moral blameworthiness. Brief for Petitioner 2328. He invokes principles of criminal culpability, concepts of international law, and the rule of lenity. Id., at 2845. Those arguments may be persuasive in determining whether a particular agency interpretation is reasonable, but they do not demonstrate that the statute is unambiguous. Petitioner all but conceded as much at argument in this Court when he indicated that the BIA has discretion to construe the duress defense in either a narrow or a broad way. Tr. of Oral Arg. 2024.

The Government, on the other hand, asserts that the statute does not allow petitioners construction. The statutory text, the Government says, directly answers that question: there is no exception for conduct that is coerced because Congress did not include one. Brief for Respondent 11. We disagree. The silence is not conclusive. The question is whether the statutory text mandates that coerced actions must be deemed assistance in persecution. On that point the statute, in its precise terms, is not explicit. Nor is this a case where it is clear that Congress had an intention on the precise question at issue. Cf. Cardoza-Fonseca, supra, at 448449.

The Government, like the BIA and the Court of Appeals, relies on Fedorenko to provide the answer. This reliance is not without some basis, as the Court there held that voluntariness was not required with respect to another persecutor bar. 449 U. S., at 512. To the extent, however, the Government deems Fedorenko to be controlling, it is in error.

In Fedorenko, the Court interpreted the Displaced Persons Act of 1948 (DPA),
62Stat.
1009. The DPA was enacted to enable European refugees driven from their homelands by the [second world] war to emigrate to the United States without regard to traditional immigration quotas. 449 U. S., at 495. Section 2(b) of the DPA provides relief to any displaced person or refugee as defined in Annex I of the Constitution of the International Refugee Organization of the United Nations (IRO Constitution).
62Stat.
1009. The IRO Constitution, as codified by Congress, excludes any individual who can be shown: (a) to have assisted the enemy in persecuting civil populations of countries, Members of the United Nations; or (b) to have voluntarily assisted the enemy forces since the outbreak of the second world war in their operations against the United Nations. Annex I, Part II, §2,
62Stat.
30513052.

The Fedorenko Court held that an individuals service as a concentration camp armed guardwhether voluntary or involuntarymade him ineligible for a visa under §2(a) of the IRO Constitution. 449 U. S., at 512. That Congress did not adopt a voluntariness requirement for §2(a), the Court noted, is plain from comparing §2(a) with §2(b), which excludes only those individuals who voluntarily assisted the enemy forces.  Ibid. The Court relied on the principle of statutory construction that the deliberate omission of the word voluntary from §2(a) compels the conclusion that the statute made all those who assisted in persecution of civilians ineligible for visas. Ibid.

Fedorenko does not compel the same conclusion in the case now before us. The textual structure of the statute in Fedorenko (voluntary is in one subsection but not the other) is not part of the statutory framework considered here. Congress did not use the word voluntary in any subsection of the persecutor bar, so its omission cannot carry the same significance.

The difference between the statutory scheme in Fedorenko and the one here is confirmed when we  look not only to the particular statutory language, but to the design of the statute as a whole and to its object and policy.  Dada v. Mukasey,
554 U. S. 1, ___ (2008) (slip op., at 13) (quoting Gozlon-Peretz v. United States,
498 U. S. 395,
407 (1991)
). Both statutes were enacted to reflect principles set forth in international agreements, but the principles differ in significant respects.

As discussed, Congress enacted the DPA in 1948 as part of an international effort to address individuals who were forced to leave their homelands during and after the second World War. Fedorenko, supra, at 495. The DPA excludes those who voluntarily assisted the enemy forces since the outbreak of the second world war,
62Stat.
3052, as well as all who assisted the enemy in persecuting civil populations of countries, id., at 3051. The latter exclusion clause makes no reference to culpability. The exclusion of even those involved in nonculpable, involuntary assistance in Nazi persecution, as an expert testified in Fedorenko, may be  [b]ecause the crime against humanity that is involved in the concentration camp puts it into a different category.  449 U. S., at 511, n. 32.

The persecutor bar in this case, by contrast, was enacted as part of the Refugee Act of 1980. Unlike the DPA, which was enacted to address not just the post war refugee problem but also the Holocaust and its horror, the Refugee Act was designed to provide a general rule for the ongoing treatment of all refugees and displaced persons. As this Court has twice recognized,  one of Congress primary purposes in passing the Refugee Act was to implement the principles agreed to in the 1967 United Nations Protocol Relating to the Status of Refugees, Jan. 31, 1967, 19 U. S. T. 6224, T. I. A. S. 6577 (1968), as well as the United Nations Convention Relating to the Status of Refugees, 189 U. N. T. S. 150 (July 28, 1951), reprinted in 19 U. S. T. 6259. Aguirre-Aguirre, 526 U. S., at 427 (quoting Cardoza-Fonseca, 480 U. S., at 436437).

These authorities illustrate why Fedorenko, which addressed a different statute enacted for a different purpose, does not control the BIAs interpretation of this persecutor bar. Whatever weight or relevance these various authorities may have in interpreting the statute should be considered by the agency in the first instance, and by any subsequent reviewing court, after our remand.

C

The Government argues that if there were any ambiguity in the text, the Boards determination that the bar contains no such exception is reasonable and thus controlling. Brief for Respondent 11. Whether such an interpretation would be reasonable, and thus owed Chevron deference, is a legitimate question; but it is not now before us. The BIA deemed its interpretation to be mandated by Fedorenko, and that error prevented it from a full consideration of the statutory question here presented.

In denying relief in this case the BIA recited a rule that has developed in its own case law in reliance on Fedorenko: [A]n aliens motivation and intent are irrelevant to the issue of whether he assisted in persecution . . . [I]t is the objective effect of an aliens actions which is controlling. App. to Pet. for Cert. 6a. The rule is based on three earlier decisions: Matter of Laipenieks, 18 I. & N. Dec. 433 (1983); Matter of Fedorenko, 19 I. & N. Dec. 57; and Matter of Rodriguez-Majano, 19 I. & N. Dec. 811 (1988).

In Matter of Laipenieks, the BIA applied the Courts Fedorenko analysis of the DPA to a different postwar statute, which provided for the deportation of anyone associated with the Nazis who ordered, incited, assisted, or otherwise participated in persecution based on a protected ground.
8 U. S. C. §1182(a)(3)(E)(i). Finding no agency or judicial decision on point, the BIA relied on Fedorenko. It recognized that the unique structure of the Fedorenko statute was not present in §1182(a)(3)(E)(i), but the BIA nevertheless adopted wholesale the Fedorenko rule: [A]s in Fedorenko, . . . the plain language of [§1182(a)(3)(E)(i)] mandates a literal interpretation, and the omission of an intent element compels the conclusion that [§1182(a)(3)(E)(i)] makes all those who assisted in the specific persecution deportable. 18 I. & N. Dec., at 464. In other words, particular motivations or intent . . . is not a relevant factor. Ibid.

The second decision, Matter of Fedorenko, also dealt with §1182(a)(3)(E)(i), and it involved the same alien whose citizenship was revoked by this Courts Fedorenko decision. This time the agency sought to deport him. Fedorenko responded by requesting suspension of deportation. He argued that, unlike the DPAs bar on any assistancevoluntary or involuntaryin persecution, see Fedorenko, 449 U. S., at 512, the text and structure of §1182(a)(3)(E)(i) required deportation only of those who voluntarily assisted in persecuting others. The BIA rejected that distinction, noting that it was foreclosed by Matter of Laipenieks: It may be, as [Fedorenko] argues, that his service at Treblinka was involuntary. . . . We need not resolve the issue, however, because as a matter of law [Fedorenkos] motivations for serving as a guard at Treblinka are immaterial to the question of his deportability under §1182(a)(3)(E)(i). 19 I. & N. Dec., at 6970.

Later, the BIA applied this Courts Fedorenko rule to the persecutor bar that is at issue in the present case. In Matter of Rodriguez-Majano, the BIA granted relief because the aliens coerced conduct as a guerrilla was not persecution based on a protected ground. 19 I. & N. Dec., at 815816. Nevertheless, in reaching its conclusion the BIA incorporated without additional analysis the Fedorenko rule as applied in Matter of Laipenieks and reiterated in Matter of Fedorenko. 19 I. & N. Dec., at 814815. The BIA reaffirmed that [t]he participation or assistance of an alien in persecution need not be of his own volition to bar him from relief. Id., at 814 (citing Fedorenko,
449 U. S. 490).

Our reading of these decisions confirms that the BIA has not exercised its interpretive authority but, instead, has determined that Fedorenko controls. This mistaken assumption stems from a failure to recognize the inapplicability of the principle of statutory construction invoked in Fedorenko, as well as a failure to appreciate the differences in statutory purpose. The BIA is not bound to apply the Fedorenko rule that motive and intent are irrelevant to the persecutor bar at issue in this case. Whether the statute permits such an interpretation based on a different course of reasoning must be determined in the first instance by the agency.

Justice Stevens would have the Court provide a definite answer to the question presented and then remand for further proceedings. That approach, however, is in tension with the ordinary remand rule. Ventura, supra, at 18; see also Cajun Elec. Power Cooperative, Inc. v. FERC, 924 F. 2d 1132, 1136 (CADC 1991) (opinion for the Court by Silberman, J., joined by R. Ginsburg and Thomas, JJ.) ([I]f an agency erroneously contends that Congress intent has been clearly expressed and has rested on that ground, we remand to require the agency to consider the question afresh in light of the ambiguity we see). Thomas is illustrative. There, the agency had not determined whether a family may constitute a social group for the purposes of refugee status. The Ninth Circuit held that the family can constitute a protected social group and that the particular family at issue did qualify. 547 U. S., at 184185. The Solicitor General sought review in this Court on whether the Ninth Circuit erred in holding, in the first instance and without prior resolution of the questions by the relevant administrative agency, that members of a family can and do constitute a particular social group, within the meaning of the Act. Id., at 185 (internal quotation marks omitted). He argued that the Ninth Circuits decision violated the Ventura ordinary remand rule. We agreed and summarily reversed. 547 U. S., at 184185

Ventura and Thomas counsel a similar result here. Because of the important differences between the statute before us and the one at issue in Fedorenko, we find it appropriate to remand to the agency for its initial determination of the statutory interpretation question and its application to this case. The agencys interpretation of the statutory meaning of persecution may be explained by a more comprehensive definition, one designed to elaborate on the term in anticipation of a wide range of potential conduct; and that expanded definition in turn may be influenced by how practical, or impractical, the standard would be in terms of its application to specific cases. These matters may have relevance in determining whether its statutory interpretation is a permissible one.

As the Court said in Ventura and reiterated in Thomas,  [t]he agency can bring its expertise to bear upon the matter; it can evaluate the evidence; it can make an initial determination; and, in doing so, it can, through informed discussion and analysis, help a court later determine whether its decision exceeds the leeway that the law provides.  547 U. S., at 186187 (quoting Ventura, supra, at 17). If the BIA decides to adopt a standard that considers voluntariness to some degree, it may be prudent and necessary for the Immigration Judge to conduct additional factfinding based on the new standard. Those determinations are for the agency to make in the first instance.

***

We reverse the judgment of the Court of Appeals and remand the case for further proceedings consistent with this opinion.

on writ of certiorari to the united states court ofappeals for the fifth circuit

[March 3, 2009]

Justice Scalia, with whom Justice Alito joins, concurring.

I agree with the Court that the statute has an ambiguity, ante, at 5, with respect to whether an alien who was coerced to assist in persecution is barred from obtaining asylum in the United States. I agree that the agency is entitled to answer that question. Ibid. See Chevron U. S. A. Inc. v. Natural Resources Defense Council, Inc.,
467 U. S. 837,
843 (1984)
. And I agree that a remand is in order, to give the agency an opportunity to clarify whether its affirmative answer was premised on an erroneous view that this Courts decision in Fedorenko v. United States,
449 U. S. 490 (1981)
, compelled it. Ante, at 11.

I would not agree to remand if I did not think that the agency has the option of adhering to its decision. The majority appears to leave that question undecided, ante, at 5 (reserving whether a particular agency interpretation is reasonable); two Justices forthrightly disagree and would require the agency to recognize at least some sort of duress exception, post, at 7 (Stevens, J., concurring in part and dissenting in part).

But good reasons for the agencys current practice existreasons adequate to satisfy the requirement that an agency act reasonably in choosing among various possible constructions of an ambiguous statute. The statute does not mandate the rule precluding the duress defense but does not foreclose it either; the agency is free to retain that rule so long as the choice to do so is soundly reasoned, not based on irrelevant or arbitrary factors (like the Fedorenko precedent).

The primary contention to the contrary is, in short, that barring aliens who persecuted under duress would punish purely nonculpable conduct. That argument suffers from at least three unjustified leaps of logic.

First, it implicitly adopts a view of culpability that is neither the only view nor one necessarily applicable here. The culpability of one who harms another under coercion is, and has always been, a subject of intense debate, raising profound questions of moral philosophy and individual responsibility. (The so-called Nuremberg defense comes readily to mind.) At common law, duress was not an accepted defense to intentional killing, see 2 W. LaFave, Substantive Criminal Law §9.7(b), pp. 7475 (2d ed. 2003); and in modern times, some states do not allow it as a defense to lesser crimes, see id., at 8182, and n. 50. Notably, there is no historical support for the duress defense when a soldier follows a military order he knows to be unlawful. Id.,§9.7(g), at 86; see also, e.g., Axtells Case, Kel. J. 13,
84Eng. Rep.
1060 (1660); Prosecutor v. Erdemovi<f f="Century Schoolbook CE">, [1997] 2 ICTY Jud. Rep. 1610, 1635 (Intl Crim. Trib. for Former Yugoslavia). It is therefore far from clear that precluding a duress defense here would, as petitioner alleges, disregard principles of blame . . . universal and persistent in American law. Brief for Petitioner 32 (quoting Morissette v. United States,
342 U. S. 246,
250 (1952)
). All of this suggests that those who are coerced to commit wrong are at least sometimes culpable enough to be treated as criminals.

More importantly, this is not a criminal matter. This Court has long understood that an order of deportation is not a punishment for crime. Fong Yue Ting v. United States,
149 U. S. 698,
730 (1893)
. Asylum is a benefit accorded by grace, not by entitlement, and withholding that benefit from all who have intentionally harmed otherswhether under coercion or notis not unreasonable.

Second, petitioner assumes that the persecutor bar must have been intended merely to punish wrongdoing. But in the context of immigration law, culpability as a relevant factor in determining admissibility is only one facet of a more general consideration: desirability. And there may well be reasons to think that those who persecuted others, even under duress, would be relatively undesirable as immigrants. If, for example, the asylum laws grant entry to those who suffered the persecution, might it not be imprudent to also grant entry to the coerced persecutor, who may end up living in the same community as one of his victims? The Nation has a legitimate interest in preventing the importation of ethnic strife from remote parts of the world, and the agency may resolve the statutory ambiguity in a way that safeguards that interest.

Finally, even if culpability is the only relevant factor, and even if a narrow, criminal-law based view of culpability is the authoritative one, a bright-line rule excluding all persecutorswhether acting under coercion or notmight still be the best way for the agency to effectuate the statutory scheme. See generally Cox & Posner, Second-Order Structure of Immigration Law, 59 Stan. L. Rev. 809 (2007). Immigration judges already face the overwhelming task of attempting to recreate, by a limited number of witnesses speaking through (often poor-quality) translation, events that took place years ago in foreign, usually impoverished countries. See Dia v. Ashcroft, 353 F. 3d 228, 261262 (CA3 2003) (en banc) (Alito, J., concurring in part and dissenting in part). Adding on top of that the burden of adjudicating claims of duress and coercion, which are extremely difficult to corroborate and necessarily pose questions of degree that require intensely fact-bound line-drawing, would increase the already inherently high risk of error. And the cost of error (viz., allowing uncoerced persecutors to remain in the country permanently) might reasonably be viewed by the agency as significantly greater than the cost of overinclusion under a bright-line rule (viz., denial of asylum to some coerced persecutorswho might anyway be entitled to protection under the Convention Against Torture, which includes no analogous persecutor bar).

It is worth noting that although the agencys objective effects approach to the statute would seem to sweep beyond the duress scenario to encompass even an alien who had no idea that his actions would objectively assist in persecution, see Castańeda-Castillo v. Gonzales, 488 F. 3d 17, 20 (CA1 2007) (en banc), there is no reason why the agency cannot consider questions of knowledge separate and apart from questions of duress. Both can be said to relate to the mental state of the persecutor,** but they present different problems which can be grappled with separately. The agency need not provide an all-embracing answer, ibid., in the present case. It may evaluate problems one by one as they arise, and whatever it might decide about an unknowing persecutor is irrelevant to petitioner, who knew exactly what he was doing.

To be clear, I do not endorse any particular rule. It is to agency officials, not to the Members of this Court, that Congress has given discretion to choose among permissible interpretations of the statute. They deserve to be told clearly whether we are serious about allowing them to exercise that discretion, or are rather firing a warning shot across the bow.

Notes

** The rationale for the duress defense, however, is conventionally not that the defendant … somehow loses his mental capacity to commit the crime in question, but rather that even though he has done the act the crime requires and has the mental state which the crime requires, his conduct … is excused. 2 LaFave, supra, §9.7(a), at 73.

on writ of certiorari to the united states court ofappeals for the fifth circuit

[March 3, 2009]

Justice Scalia, with whom Justice Alito joins, concurring.

I agree with the Court that the statute has an ambiguity, ante, at 5, with respect to whether an alien who was coerced to assist in persecution is barred from obtaining asylum in the United States. I agree that the agency is entitled to answer that question. Ibid. See Chevron U. S. A. Inc. v. Natural Resources Defense Council, Inc.,
467 U. S. 837,
843 (1984)
. And I agree that a remand is in order, to give the agency an opportunity to clarify whether its affirmative answer was premised on an erroneous view that this Courts decision in Fedorenko v. United States,
449 U. S. 490 (1981)
, compelled it. Ante, at 11.

I would not agree to remand if I did not think that the agency has the option of adhering to its decision. The majority appears to leave that question undecided, ante, at 5 (reserving whether a particular agency interpretation is reasonable); two Justices forthrightly disagree and would require the agency to recognize at least some sort of duress exception, post, at 7 (Stevens, J., concurring in part and dissenting in part).

But good reasons for the agencys current practice existreasons adequate to satisfy the requirement that an agency act reasonably in choosing among various possible constructions of an ambiguous statute. The statute does not mandate the rule precluding the duress defense but does not foreclose it either; the agency is free to retain that rule so long as the choice to do so is soundly reasoned, not based on irrelevant or arbitrary factors (like the Fedorenko precedent).

The primary contention to the contrary is, in short, that barring aliens who persecuted under duress would punish purely nonculpable conduct. That argument suffers from at least three unjustified leaps of logic.

First, it implicitly adopts a view of culpability that is neither the only view nor one necessarily applicable here. The culpability of one who harms another under coercion is, and has always been, a subject of intense debate, raising profound questions of moral philosophy and individual responsibility. (The so-called Nuremberg defense comes readily to mind.) At common law, duress was not an accepted defense to intentional killing, see 2 W. LaFave, Substantive Criminal Law §9.7(b), pp. 7475 (2d ed. 2003); and in modern times, some states do not allow it as a defense to lesser crimes, see id., at 8182, and n. 50. Notably, there is no historical support for the duress defense when a soldier follows a military order he knows to be unlawful. Id.,§9.7(g), at 86; see also, e.g., Axtells Case, Kel. J. 13,
84Eng. Rep.
1060 (1660); Prosecutor v. Erdemovi<f f="Century Schoolbook CE">, [1997] 2 ICTY Jud. Rep. 1610, 1635 (Intl Crim. Trib. for Former Yugoslavia). It is therefore far from clear that precluding a duress defense here would, as petitioner alleges, disregard principles of blame . . . universal and persistent in American law. Brief for Petitioner 32 (quoting Morissette v. United States,
342 U. S. 246,
250 (1952)
). All of this suggests that those who are coerced to commit wrong are at least sometimes culpable enough to be treated as criminals.

More importantly, this is not a criminal matter. This Court has long understood that an order of deportation is not a punishment for crime. Fong Yue Ting v. United States,
149 U. S. 698,
730 (1893)
. Asylum is a benefit accorded by grace, not by entitlement, and withholding that benefit from all who have intentionally harmed otherswhether under coercion or notis not unreasonable.

Second, petitioner assumes that the persecutor bar must have been intended merely to punish wrongdoing. But in the context of immigration law, culpability as a relevant factor in determining admissibility is only one facet of a more general consideration: desirability. And there may well be reasons to think that those who persecuted others, even under duress, would be relatively undesirable as immigrants. If, for example, the asylum laws grant entry to those who suffered the persecution, might it not be imprudent to also grant entry to the coerced persecutor, who may end up living in the same community as one of his victims? The Nation has a legitimate interest in preventing the importation of ethnic strife from remote parts of the world, and the agency may resolve the statutory ambiguity in a way that safeguards that interest.

Finally, even if culpability is the only relevant factor, and even if a narrow, criminal-law based view of culpability is the authoritative one, a bright-line rule excluding all persecutorswhether acting under coercion or notmight still be the best way for the agency to effectuate the statutory scheme. See generally Cox & Posner, Second-Order Structure of Immigration Law, 59 Stan. L. Rev. 809 (2007). Immigration judges already face the overwhelming task of attempting to recreate, by a limited number of witnesses speaking through (often poor-quality) translation, events that took place years ago in foreign, usually impoverished countries. See Dia v. Ashcroft, 353 F. 3d 228, 261262 (CA3 2003) (en banc) (Alito, J., concurring in part and dissenting in part). Adding on top of that the burden of adjudicating claims of duress and coercion, which are extremely difficult to corroborate and necessarily pose questions of degree that require intensely fact-bound line-drawing, would increase the already inherently high risk of error. And the cost of error (viz., allowing uncoerced persecutors to remain in the country permanently) might reasonably be viewed by the agency as significantly greater than the cost of overinclusion under a bright-line rule (viz., denial of asylum to some coerced persecutorswho might anyway be entitled to protection under the Convention Against Torture, which includes no analogous persecutor bar).

It is worth noting that although the agencys objective effects approach to the statute would seem to sweep beyond the duress scenario to encompass even an alien who had no idea that his actions would objectively assist in persecution, see Castańeda-Castillo v. Gonzales, 488 F. 3d 17, 20 (CA1 2007) (en banc), there is no reason why the agency cannot consider questions of knowledge separate and apart from questions of duress. Both can be said to relate to the mental state of the persecutor,** but they present different problems which can be grappled with separately. The agency need not provide an all-embracing answer, ibid., in the present case. It may evaluate problems one by one as they arise, and whatever it might decide about an unknowing persecutor is irrelevant to petitioner, who knew exactly what he was doing.

To be clear, I do not endorse any particular rule. It is to agency officials, not to the Members of this Court, that Congress has given discretion to choose among permissible interpretations of the statute. They deserve to be told clearly whether we are serious about allowing them to exercise that discretion, or are rather firing a warning shot across the bow.

Notes

** The rationale for the duress defense, however, is conventionally not that the defendant … somehow loses his mental capacity to commit the crime in question, but rather that even though he has done the act the crime requires and has the mental state which the crime requires, his conduct … is excused. 2 LaFave, supra, §9.7(a), at 73.

on writ of certiorari to the united states court ofappeals for the fifth circuit

[March 3, 2009]

Justice Scalia, with whom Justice Alito joins, concurring.

I agree with the Court that the statute has an ambiguity, ante, at 5, with respect to whether an alien who was coerced to assist in persecution is barred from obtaining asylum in the United States. I agree that the agency is entitled to answer that question. Ibid. See Chevron U. S. A. Inc. v. Natural Resources Defense Council, Inc.,
467 U. S. 837,
843 (1984)
. And I agree that a remand is in order, to give the agency an opportunity to clarify whether its affirmative answer was premised on an erroneous view that this Courts decision in Fedorenko v. United States,
449 U. S. 490 (1981)
, compelled it. Ante, at 11.

I would not agree to remand if I did not think that the agency has the option of adhering to its decision. The majority appears to leave that question undecided, ante, at 5 (reserving whether a particular agency interpretation is reasonable); two Justices forthrightly disagree and would require the agency to recognize at least some sort of duress exception, post, at 7 (Stevens, J., concurring in part and dissenting in part).

But good reasons for the agencys current practice existreasons adequate to satisfy the requirement that an agency act reasonably in choosing among various possible constructions of an ambiguous statute. The statute does not mandate the rule precluding the duress defense but does not foreclose it either; the agency is free to retain that rule so long as the choice to do so is soundly reasoned, not based on irrelevant or arbitrary factors (like the Fedorenko precedent).

The primary contention to the contrary is, in short, that barring aliens who persecuted under duress would punish purely nonculpable conduct. That argument suffers from at least three unjustified leaps of logic.

First, it implicitly adopts a view of culpability that is neither the only view nor one necessarily applicable here. The culpability of one who harms another under coercion is, and has always been, a subject of intense debate, raising profound questions of moral philosophy and individual responsibility. (The so-called Nuremberg defense comes readily to mind.) At common law, duress was not an accepted defense to intentional killing, see 2 W. LaFave, Substantive Criminal Law §9.7(b), pp. 7475 (2d ed. 2003); and in modern times, some states do not allow it as a defense to lesser crimes, see id., at 8182, and n. 50. Notably, there is no historical support for the duress defense when a soldier follows a military order he knows to be unlawful. Id.,§9.7(g), at 86; see also, e.g., Axtells Case, Kel. J. 13,
84Eng. Rep.
1060 (1660); Prosecutor v. Erdemovi<f f="Century Schoolbook CE">, [1997] 2 ICTY Jud. Rep. 1610, 1635 (Intl Crim. Trib. for Former Yugoslavia). It is therefore far from clear that precluding a duress defense here would, as petitioner alleges, disregard principles of blame . . . universal and persistent in American law. Brief for Petitioner 32 (quoting Morissette v. United States,
342 U. S. 246,
250 (1952)
). All of this suggests that those who are coerced to commit wrong are at least sometimes culpable enough to be treated as criminals.

More importantly, this is not a criminal matter. This Court has long understood that an order of deportation is not a punishment for crime. Fong Yue Ting v. United States,
149 U. S. 698,
730 (1893)
. Asylum is a benefit accorded by grace, not by entitlement, and withholding that benefit from all who have intentionally harmed otherswhether under coercion or notis not unreasonable.

Second, petitioner assumes that the persecutor bar must have been intended merely to punish wrongdoing. But in the context of immigration law, culpability as a relevant factor in determining admissibility is only one facet of a more general consideration: desirability. And there may well be reasons to think that those who persecuted others, even under duress, would be relatively undesirable as immigrants. If, for example, the asylum laws grant entry to those who suffered the persecution, might it not be imprudent to also grant entry to the coerced persecutor, who may end up living in the same community as one of his victims? The Nation has a legitimate interest in preventing the importation of ethnic strife from remote parts of the world, and the agency may resolve the statutory ambiguity in a way that safeguards that interest.

Finally, even if culpability is the only relevant factor, and even if a narrow, criminal-law based view of culpability is the authoritative one, a bright-line rule excluding all persecutorswhether acting under coercion or notmight still be the best way for the agency to effectuate the statutory scheme. See generally Cox & Posner, Second-Order Structure of Immigration Law, 59 Stan. L. Rev. 809 (2007). Immigration judges already face the overwhelming task of attempting to recreate, by a limited number of witnesses speaking through (often poor-quality) translation, events that took place years ago in foreign, usually impoverished countries. See Dia v. Ashcroft, 353 F. 3d 228, 261262 (CA3 2003) (en banc) (Alito, J., concurring in part and dissenting in part). Adding on top of that the burden of adjudicating claims of duress and coercion, which are extremely difficult to corroborate and necessarily pose questions of degree that require intensely fact-bound line-drawing, would increase the already inherently high risk of error. And the cost of error (viz., allowing uncoerced persecutors to remain in the country permanently) might reasonably be viewed by the agency as significantly greater than the cost of overinclusion under a bright-line rule (viz., denial of asylum to some coerced persecutorswho might anyway be entitled to protection under the Convention Against Torture, which includes no analogous persecutor bar).

It is worth noting that although the agencys objective effects approach to the statute would seem to sweep beyond the duress scenario to encompass even an alien who had no idea that his actions would objectively assist in persecution, see Castańeda-Castillo v. Gonzales, 488 F. 3d 17, 20 (CA1 2007) (en banc), there is no reason why the agency cannot consider questions of knowledge separate and apart from questions of duress. Both can be said to relate to the mental state of the persecutor,** but they present different problems which can be grappled with separately. The agency need not provide an all-embracing answer, ibid., in the present case. It may evaluate problems one by one as they arise, and whatever it might decide about an unknowing persecutor is irrelevant to petitioner, who knew exactly what he was doing.

To be clear, I do not endorse any particular rule. It is to agency officials, not to the Members of this Court, that Congress has given discretion to choose among permissible interpretations of the statute. They deserve to be told clearly whether we are serious about allowing them to exercise that discretion, or are rather firing a warning shot across the bow.

Notes

** The rationale for the duress defense, however, is conventionally not that the defendant … somehow loses his mental capacity to commit the crime in question, but rather that even though he has done the act the crime requires and has the mental state which the crime requires, his conduct … is excused. 2 LaFave, supra, §9.7(a), at 73.

on writ of certiorari to the united states court ofappeals for the fifth circuit

[March 3, 2009]

Justice Scalia, with whom Justice Alito joins, concurring.

I agree with the Court that the statute has an ambiguity, ante, at 5, with respect to whether an alien who was coerced to assist in persecution is barred from obtaining asylum in the United States. I agree that the agency is entitled to answer that question. Ibid. See Chevron U. S. A. Inc. v. Natural Resources Defense Council, Inc.,
467 U. S. 837,
843 (1984)
. And I agree that a remand is in order, to give the agency an opportunity to clarify whether its affirmative answer was premised on an erroneous view that this Courts decision in Fedorenko v. United States,
449 U. S. 490 (1981)
, compelled it. Ante, at 11.

I would not agree to remand if I did not think that the agency has the option of adhering to its decision. The majority appears to leave that question undecided, ante, at 5 (reserving whether a particular agency interpretation is reasonable); two Justices forthrightly disagree and would require the agency to recognize at least some sort of duress exception, post, at 7 (Stevens, J., concurring in part and dissenting in part).

But good reasons for the agencys current practice existreasons adequate to satisfy the requirement that an agency act reasonably in choosing among various possible constructions of an ambiguous statute. The statute does not mandate the rule precluding the duress defense but does not foreclose it either; the agency is free to retain that rule so long as the choice to do so is soundly reasoned, not based on irrelevant or arbitrary factors (like the Fedorenko precedent).

The primary contention to the contrary is, in short, that barring aliens who persecuted under duress would punish purely nonculpable conduct. That argument suffers from at least three unjustified leaps of logic.

First, it implicitly adopts a view of culpability that is neither the only view nor one necessarily applicable here. The culpability of one who harms another under coercion is, and has always been, a subject of intense debate, raising profound questions of moral philosophy and individual responsibility. (The so-called Nuremberg defense comes readily to mind.) At common law, duress was not an accepted defense to intentional killing, see 2 W. LaFave, Substantive Criminal Law §9.7(b), pp. 7475 (2d ed. 2003); and in modern times, some states do not allow it as a defense to lesser crimes, see id., at 8182, and n. 50. Notably, there is no historical support for the duress defense when a soldier follows a military order he knows to be unlawful. Id.,§9.7(g), at 86; see also, e.g., Axtells Case, Kel. J. 13,
84Eng. Rep.
1060 (1660); Prosecutor v. Erdemovi<f f="Century Schoolbook CE">, [1997] 2 ICTY Jud. Rep. 1610, 1635 (Intl Crim. Trib. for Former Yugoslavia). It is therefore far from clear that precluding a duress defense here would, as petitioner alleges, disregard principles of blame . . . universal and persistent in American law. Brief for Petitioner 32 (quoting Morissette v. United States,
342 U. S. 246,
250 (1952)
). All of this suggests that those who are coerced to commit wrong are at least sometimes culpable enough to be treated as criminals.

More importantly, this is not a criminal matter. This Court has long understood that an order of deportation is not a punishment for crime. Fong Yue Ting v. United States,
149 U. S. 698,
730 (1893)
. Asylum is a benefit accorded by grace, not by entitlement, and withholding that benefit from all who have intentionally harmed otherswhether under coercion or notis not unreasonable.

Second, petitioner assumes that the persecutor bar must have been intended merely to punish wrongdoing. But in the context of immigration law, culpability as a relevant factor in determining admissibility is only one facet of a more general consideration: desirability. And there may well be reasons to think that those who persecuted others, even under duress, would be relatively undesirable as immigrants. If, for example, the asylum laws grant entry to those who suffered the persecution, might it not be imprudent to also grant entry to the coerced persecutor, who may end up living in the same community as one of his victims? The Nation has a legitimate interest in preventing the importation of ethnic strife from remote parts of the world, and the agency may resolve the statutory ambiguity in a way that safeguards that interest.

Finally, even if culpability is the only relevant factor, and even if a narrow, criminal-law based view of culpability is the authoritative one, a bright-line rule excluding all persecutorswhether acting under coercion or notmight still be the best way for the agency to effectuate the statutory scheme. See generally Cox & Posner, Second-Order Structure of Immigration Law, 59 Stan. L. Rev. 809 (2007). Immigration judges already face the overwhelming task of attempting to recreate, by a limited number of witnesses speaking through (often poor-quality) translation, events that took place years ago in foreign, usually impoverished countries. See Dia v. Ashcroft, 353 F. 3d 228, 261262 (CA3 2003) (en banc) (Alito, J., concurring in part and dissenting in part). Adding on top of that the burden of adjudicating claims of duress and coercion, which are extremely difficult to corroborate and necessarily pose questions of degree that require intensely fact-bound line-drawing, would increase the already inherently high risk of error. And the cost of error (viz., allowing uncoerced persecutors to remain in the country permanently) might reasonably be viewed by the agency as significantly greater than the cost of overinclusion under a bright-line rule (viz., denial of asylum to some coerced persecutorswho might anyway be entitled to protection under the Convention Against Torture, which includes no analogous persecutor bar).

It is worth noting that although the agencys objective effects approach to the statute would seem to sweep beyond the duress scenario to encompass even an alien who had no idea that his actions would objectively assist in persecution, see Castańeda-Castillo v. Gonzales, 488 F. 3d 17, 20 (CA1 2007) (en banc), there is no reason why the agency cannot consider questions of knowledge separate and apart from questions of duress. Both can be said to relate to the mental state of the persecutor,** but they present different problems which can be grappled with separately. The agency need not provide an all-embracing answer, ibid., in the present case. It may evaluate problems one by one as they arise, and whatever it might decide about an unknowing persecutor is irrelevant to petitioner, who knew exactly what he was doing.

To be clear, I do not endorse any particular rule. It is to agency officials, not to the Members of this Court, that Congress has given discretion to choose among permissible interpretations of the statute. They deserve to be told clearly whether we are serious about allowing them to exercise that discretion, or are rather firing a warning shot across the bow.

Notes

** The rationale for the duress defense, however, is conventionally not that the defendant … somehow loses his mental capacity to commit the crime in question, but rather that even though he has done the act the crime requires and has the mental state which the crime requires, his conduct … is excused. 2 LaFave, supra, §9.7(a), at 73.

on writ of certiorari to the united states court ofappeals for the fifth circuit

[March 3, 2009]

Justice Scalia, with whom Justice Alito joins, concurring.

I agree with the Court that the statute has an ambiguity, ante, at 5, with respect to whether an alien who was coerced to assist in persecution is barred from obtaining asylum in the United States. I agree that the agency is entitled to answer that question. Ibid. See Chevron U. S. A. Inc. v. Natural Resources Defense Council, Inc.,
467 U. S. 837,
843 (1984)
. And I agree that a remand is in order, to give the agency an opportunity to clarify whether its affirmative answer was premised on an erroneous view that this Courts decision in Fedorenko v. United States,
449 U. S. 490 (1981)
, compelled it. Ante, at 11.

I would not agree to remand if I did not think that the agency has the option of adhering to its decision. The majority appears to leave that question undecided, ante, at 5 (reserving whether a particular agency interpretation is reasonable); two Justices forthrightly disagree and would require the agency to recognize at least some sort of duress exception, post, at 7 (Stevens, J., concurring in part and dissenting in part).

But good reasons for the agencys current practice existreasons adequate to satisfy the requirement that an agency act reasonably in choosing among various possible constructions of an ambiguous statute. The statute does not mandate the rule precluding the duress defense but does not foreclose it either; the agency is free to retain that rule so long as the choice to do so is soundly reasoned, not based on irrelevant or arbitrary factors (like the Fedorenko precedent).

The primary contention to the contrary is, in short, that barring aliens who persecuted under duress would punish purely nonculpable conduct. That argument suffers from at least three unjustified leaps of logic.

First, it implicitly adopts a view of culpability that is neither the only view nor one necessarily applicable here. The culpability of one who harms another under coercion is, and has always been, a subject of intense debate, raising profound questions of moral philosophy and individual responsibility. (The so-called Nuremberg defense comes readily to mind.) At common law, duress was not an accepted defense to intentional killing, see 2 W. LaFave, Substantive Criminal Law §9.7(b), pp. 7475 (2d ed. 2003); and in modern times, some states do not allow it as a defense to lesser crimes, see id., at 8182, and n. 50. Notably, there is no historical support for the duress defense when a soldier follows a military order he knows to be unlawful. Id.,§9.7(g), at 86; see also, e.g., Axtells Case, Kel. J. 13,
84Eng. Rep.
1060 (1660); Prosecutor v. Erdemovi<f f="Century Schoolbook CE">, [1997] 2 ICTY Jud. Rep. 1610, 1635 (Intl Crim. Trib. for Former Yugoslavia). It is therefore far from clear that precluding a duress defense here would, as petitioner alleges, disregard principles of blame . . . universal and persistent in American law. Brief for Petitioner 32 (quoting Morissette v. United States,
342 U. S. 246,
250 (1952)
). All of this suggests that those who are coerced to commit wrong are at least sometimes culpable enough to be treated as criminals.

More importantly, this is not a criminal matter. This Court has long understood that an order of deportation is not a punishment for crime. Fong Yue Ting v. United States,
149 U. S. 698,
730 (1893)
. Asylum is a benefit accorded by grace, not by entitlement, and withholding that benefit from all who have intentionally harmed otherswhether under coercion or notis not unreasonable.

Second, petitioner assumes that the persecutor bar must have been intended merely to punish wrongdoing. But in the context of immigration law, culpability as a relevant factor in determining admissibility is only one facet of a more general consideration: desirability. And there may well be reasons to think that those who persecuted others, even under duress, would be relatively undesirable as immigrants. If, for example, the asylum laws grant entry to those who suffered the persecution, might it not be imprudent to also grant entry to the coerced persecutor, who may end up living in the same community as one of his victims? The Nation has a legitimate interest in preventing the importation of ethnic strife from remote parts of the world, and the agency may resolve the statutory ambiguity in a way that safeguards that interest.

Finally, even if culpability is the only relevant factor, and even if a narrow, criminal-law based view of culpability is the authoritative one, a bright-line rule excluding all persecutorswhether acting under coercion or notmight still be the best way for the agency to effectuate the statutory scheme. See generally Cox & Posner, Second-Order Structure of Immigration Law, 59 Stan. L. Rev. 809 (2007). Immigration judges already face the overwhelming task of attempting to recreate, by a limited number of witnesses speaking through (often poor-quality) translation, events that took place years ago in foreign, usually impoverished countries. See Dia v. Ashcroft, 353 F. 3d 228, 261262 (CA3 2003) (en banc) (Alito, J., concurring in part and dissenting in part). Adding on top of that the burden of adjudicating claims of duress and coercion, which are extremely difficult to corroborate and necessarily pose questions of degree that require intensely fact-bound line-drawing, would increase the already inherently high risk of error. And the cost of error (viz., allowing uncoerced persecutors to remain in the country permanently) might reasonably be viewed by the agency as significantly greater than the cost of overinclusion under a bright-line rule (viz., denial of asylum to some coerced persecutorswho might anyway be entitled to protection under the Convention Against Torture, which includes no analogous persecutor bar).

It is worth noting that although the agencys objective effects approach to the statute would seem to sweep beyond the duress scenario to encompass even an alien who had no idea that his actions would objectively assist in persecution, see Castańeda-Castillo v. Gonzales, 488 F. 3d 17, 20 (CA1 2007) (en banc), there is no reason why the agency cannot consider questions of knowledge separate and apart from questions of duress. Both can be said to relate to the mental state of the persecutor,** but they present different problems which can be grappled with separately. The agency need not provide an all-embracing answer, ibid., in the present case. It may evaluate problems one by one as they arise, and whatever it might decide about an unknowing persecutor is irrelevant to petitioner, who knew exactly what he was doing.

To be clear, I do not endorse any particular rule. It is to agency officials, not to the Members of this Court, that Congress has given discretion to choose among permissible interpretations of the statute. They deserve to be told clearly whether we are serious about allowing them to exercise that discretion, or are rather firing a warning shot across the bow.

Notes

** The rationale for the duress defense, however, is conventionally not that the defendant … somehow loses his mental capacity to commit the crime in question, but rather that even though he has done the act the crime requires and has the mental state which the crime requires, his conduct … is excused. 2 LaFave, supra, §9.7(a), at 73.

on writ of certiorari to the united states court ofappeals for the fifth circuit

[March 3, 2009]

Justice Scalia, with whom Justice Alito joins, concurring.

I agree with the Court that the statute has an ambiguity, ante, at 5, with respect to whether an alien who was coerced to assist in persecution is barred from obtaining asylum in the United States. I agree that the agency is entitled to answer that question. Ibid. See Chevron U. S. A. Inc. v. Natural Resources Defense Council, Inc.,
467 U. S. 837,
843 (1984)
. And I agree that a remand is in order, to give the agency an opportunity to clarify whether its affirmative answer was premised on an erroneous view that this Courts decision in Fedorenko v. United States,
449 U. S. 490 (1981)
, compelled it. Ante, at 11.

I would not agree to remand if I did not think that the agency has the option of adhering to its decision. The majority appears to leave that question undecided, ante, at 5 (reserving whether a particular agency interpretation is reasonable); two Justices forthrightly disagree and would require the agency to recognize at least some sort of duress exception, post, at 7 (Stevens, J., concurring in part and dissenting in part).

But good reasons for the agencys current practice existreasons adequate to satisfy the requirement that an agency act reasonably in choosing among various possible constructions of an ambiguous statute. The statute does not mandate the rule precluding the duress defense but does not foreclose it either; the agency is free to retain that rule so long as the choice to do so is soundly reasoned, not based on irrelevant or arbitrary factors (like the Fedorenko precedent).

The primary contention to the contrary is, in short, that barring aliens who persecuted under duress would punish purely nonculpable conduct. That argument suffers from at least three unjustified leaps of logic.

First, it implicitly adopts a view of culpability that is neither the only view nor one necessarily applicable here. The culpability of one who harms another under coercion is, and has always been, a subject of intense debate, raising profound questions of moral philosophy and individual responsibility. (The so-called Nuremberg defense comes readily to mind.) At common law, duress was not an accepted defense to intentional killing, see 2 W. LaFave, Substantive Criminal Law §9.7(b), pp. 7475 (2d ed. 2003); and in modern times, some states do not allow it as a defense to lesser crimes, see id., at 8182, and n. 50. Notably, there is no historical support for the duress defense when a soldier follows a military order he knows to be unlawful. Id.,§9.7(g), at 86; see also, e.g., Axtells Case, Kel. J. 13,
84Eng. Rep.
1060 (1660); Prosecutor v. Erdemovi<f f="Century Schoolbook CE">, [1997] 2 ICTY Jud. Rep. 1610, 1635 (Intl Crim. Trib. for Former Yugoslavia). It is therefore far from clear that precluding a duress defense here would, as petitioner alleges, disregard principles of blame . . . universal and persistent in American law. Brief for Petitioner 32 (quoting Morissette v. United States,
342 U. S. 246,
250 (1952)
). All of this suggests that those who are coerced to commit wrong are at least sometimes culpable enough to be treated as criminals.

More importantly, this is not a criminal matter. This Court has long understood that an order of deportation is not a punishment for crime. Fong Yue Ting v. United States,
149 U. S. 698,
730 (1893)
. Asylum is a benefit accorded by grace, not by entitlement, and withholding that benefit from all who have intentionally harmed otherswhether under coercion or notis not unreasonable.

Second, petitioner assumes that the persecutor bar must have been intended merely to punish wrongdoing. But in the context of immigration law, culpability as a relevant factor in determining admissibility is only one facet of a more general consideration: desirability. And there may well be reasons to think that those who persecuted others, even under duress, would be relatively undesirable as immigrants. If, for example, the asylum laws grant entry to those who suffered the persecution, might it not be imprudent to also grant entry to the coerced persecutor, who may end up living in the same community as one of his victims? The Nation has a legitimate interest in preventing the importation of ethnic strife from remote parts of the world, and the agency may resolve the statutory ambiguity in a way that safeguards that interest.

Finally, even if culpability is the only relevant factor, and even if a narrow, criminal-law based view of culpability is the authoritative one, a bright-line rule excluding all persecutorswhether acting under coercion or notmight still be the best way for the agency to effectuate the statutory scheme. See generally Cox & Posner, Second-Order Structure of Immigration Law, 59 Stan. L. Rev. 809 (2007). Immigration judges already face the overwhelming task of attempting to recreate, by a limited number of witnesses speaking through (often poor-quality) translation, events that took place years ago in foreign, usually impoverished countries. See Dia v. Ashcroft, 353 F. 3d 228, 261262 (CA3 2003) (en banc) (Alito, J., concurring in part and dissenting in part). Adding on top of that the burden of adjudicating claims of duress and coercion, which are extremely difficult to corroborate and necessarily pose questions of degree that require intensely fact-bound line-drawing, would increase the already inherently high risk of error. And the cost of error (viz., allowing uncoerced persecutors to remain in the country permanently) might reasonably be viewed by the agency as significantly greater than the cost of overinclusion under a bright-line rule (viz., denial of asylum to some coerced persecutorswho might anyway be entitled to protection under the Convention Against Torture, which includes no analogous persecutor bar).

It is worth noting that although the agencys objective effects approach to the statute would seem to sweep beyond the duress scenario to encompass even an alien who had no idea that his actions would objectively assist in persecution, see Castańeda-Castillo v. Gonzales, 488 F. 3d 17, 20 (CA1 2007) (en banc), there is no reason why the agency cannot consider questions of knowledge separate and apart from questions of duress. Both can be said to relate to the mental state of the persecutor,** but they present different problems which can be grappled with separately. The agency need not provide an all-embracing answer, ibid., in the present case. It may evaluate problems one by one as they arise, and whatever it might decide about an unknowing persecutor is irrelevant to petitioner, who knew exactly what he was doing.

To be clear, I do not endorse any particular rule. It is to agency officials, not to the Members of this Court, that Congress has given discretion to choose among permissible interpretations of the statute. They deserve to be told clearly whether we are serious about allowing them to exercise that discretion, or are rather firing a warning shot across the bow.

Notes

** The rationale for the duress defense, however, is conventionally not that the defendant … somehow loses his mental capacity to commit the crime in question, but rather that even though he has done the act the crime requires and has the mental state which the crime requires, his conduct … is excused. 2 LaFave, supra, §9.7(a), at 73.

on writ of certiorari to the united states court ofappeals for the fifth circuit

[March 3, 2009]

Justice Scalia, with whom Justice Alito joins, concurring.

I agree with the Court that the statute has an ambiguity, ante, at 5, with respect to whether an alien who was coerced to assist in persecution is barred from obtaining asylum in the United States. I agree that the agency is entitled to answer that question. Ibid. See Chevron U. S. A. Inc. v. Natural Resources Defense Council, Inc.,
467 U. S. 837,
843 (1984)
. And I agree that a remand is in order, to give the agency an opportunity to clarify whether its affirmative answer was premised on an erroneous view that this Courts decision in Fedorenko v. United States,
449 U. S. 490 (1981)
, compelled it. Ante, at 11.

I would not agree to remand if I did not think that the agency has the option of adhering to its decision. The majority appears to leave that question undecided, ante, at 5 (reserving whether a particular agency interpretation is reasonable); two Justices forthrightly disagree and would require the agency to recognize at least some sort of duress exception, post, at 7 (Stevens, J., concurring in part and dissenting in part).

But good reasons for the agencys current practice existreasons adequate to satisfy the requirement that an agency act reasonably in choosing among various possible constructions of an ambiguous statute. The statute does not mandate the rule precluding the duress defense but does not foreclose it either; the agency is free to retain that rule so long as the choice to do so is soundly reasoned, not based on irrelevant or arbitrary factors (like the Fedorenko precedent).

The primary contention to the contrary is, in short, that barring aliens who persecuted under duress would punish purely nonculpable conduct. That argument suffers from at least three unjustified leaps of logic.

First, it implicitly adopts a view of culpability that is neither the only view nor one necessarily applicable here. The culpability of one who harms another under coercion is, and has always been, a subject of intense debate, raising profound questions of moral philosophy and individual responsibility. (The so-called Nuremberg defense comes readily to mind.) At common law, duress was not an accepted defense to intentional killing, see 2 W. LaFave, Substantive Criminal Law §9.7(b), pp. 7475 (2d ed. 2003); and in modern times, some states do not allow it as a defense to lesser crimes, see id., at 8182, and n. 50. Notably, there is no historical support for the duress defense when a soldier follows a military order he knows to be unlawful. Id.,§9.7(g), at 86; see also, e.g., Axtells Case, Kel. J. 13,
84Eng. Rep.
1060 (1660); Prosecutor v. Erdemovi<f f="Century Schoolbook CE">, [1997] 2 ICTY Jud. Rep. 1610, 1635 (Intl Crim. Trib. for Former Yugoslavia). It is therefore far from clear that precluding a duress defense here would, as petitioner alleges, disregard principles of blame . . . universal and persistent in American law. Brief for Petitioner 32 (quoting Morissette v. United States,
342 U. S. 246,
250 (1952)
). All of this suggests that those who are coerced to commit wrong are at least sometimes culpable enough to be treated as criminals.

More importantly, this is not a criminal matter. This Court has long understood that an order of deportation is not a punishment for crime. Fong Yue Ting v. United States,
149 U. S. 698,
730 (1893)
. Asylum is a benefit accorded by grace, not by entitlement, and withholding that benefit from all who have intentionally harmed otherswhether under coercion or notis not unreasonable.

Second, petitioner assumes that the persecutor bar must have been intended merely to punish wrongdoing. But in the context of immigration law, culpability as a relevant factor in determining admissibility is only one facet of a more general consideration: desirability. And there may well be reasons to think that those who persecuted others, even under duress, would be relatively undesirable as immigrants. If, for example, the asylum laws grant entry to those who suffered the persecution, might it not be imprudent to also grant entry to the coerced persecutor, who may end up living in the same community as one of his victims? The Nation has a legitimate interest in preventing the importation of ethnic strife from remote parts of the world, and the agency may resolve the statutory ambiguity in a way that safeguards that interest.

Finally, even if culpability is the only relevant factor, and even if a narrow, criminal-law based view of culpability is the authoritative one, a bright-line rule excluding all persecutorswhether acting under coercion or notmight still be the best way for the agency to effectuate the statutory scheme. See generally Cox & Posner, Second-Order Structure of Immigration Law, 59 Stan. L. Rev. 809 (2007). Immigration judges already face the overwhelming task of attempting to recreate, by a limited number of witnesses speaking through (often poor-quality) translation, events that took place years ago in foreign, usually impoverished countries. See Dia v. Ashcroft, 353 F. 3d 228, 261262 (CA3 2003) (en banc) (Alito, J., concurring in part and dissenting in part). Adding on top of that the burden of adjudicating claims of duress and coercion, which are extremely difficult to corroborate and necessarily pose questions of degree that require intensely fact-bound line-drawing, would increase the already inherently high risk of error. And the cost of error (viz., allowing uncoerced persecutors to remain in the country permanently) might reasonably be viewed by the agency as significantly greater than the cost of overinclusion under a bright-line rule (viz., denial of asylum to some coerced persecutorswho might anyway be entitled to protection under the Convention Against Torture, which includes no analogous persecutor bar).

It is worth noting that although the agencys objective effects approach to the statute would seem to sweep beyond the duress scenario to encompass even an alien who had no idea that his actions would objectively assist in persecution, see Castańeda-Castillo v. Gonzales, 488 F. 3d 17, 20 (CA1 2007) (en banc), there is no reason why the agency cannot consider questions of knowledge separate and apart from questions of duress. Both can be said to relate to the mental state of the persecutor,** but they present different problems which can be grappled with separately. The agency need not provide an all-embracing answer, ibid., in the present case. It may evaluate problems one by one as they arise, and whatever it might decide about an unknowing persecutor is irrelevant to petitioner, who knew exactly what he was doing.

To be clear, I do not endorse any particular rule. It is to agency officials, not to the Members of this Court, that Congress has given discretion to choose among permissible interpretations of the statute. They deserve to be told clearly whether we are serious about allowing them to exercise that discretion, or are rather firing a warning shot across the bow.

Notes

** The rationale for the duress defense, however, is conventionally not that the defendant … somehow loses his mental capacity to commit the crime in question, but rather that even though he has done the act the crime requires and has the mental state which the crime requires, his conduct … is excused. 2 LaFave, supra, §9.7(a), at 73.

on writ of certiorari to the united states court ofappeals for the fifth circuit

[March 3, 2009]

Justice Scalia, with whom Justice Alito joins, concurring.

I agree with the Court that the statute has an ambiguity, ante, at 5, with respect to whether an alien who was coerced to assist in persecution is barred from obtaining asylum in the United States. I agree that the agency is entitled to answer that question. Ibid. See Chevron U. S. A. Inc. v. Natural Resources Defense Council, Inc.,
467 U. S. 837,
843 (1984)
. And I agree that a remand is in order, to give the agency an opportunity to clarify whether its affirmative answer was premised on an erroneous view that this Courts decision in Fedorenko v. United States,
449 U. S. 490 (1981)
, compelled it. Ante, at 11.

I would not agree to remand if I did not think that the agency has the option of adhering to its decision. The majority appears to leave that question undecided, ante, at 5 (reserving whether a particular agency interpretation is reasonable); two Justices forthrightly disagree and would require the agency to recognize at least some sort of duress exception, post, at 7 (Stevens, J., concurring in part and dissenting in part).

But good reasons for the agencys current practice existreasons adequate to satisfy the requirement that an agency act reasonably in choosing among various possible constructions of an ambiguous statute. The statute does not mandate the rule precluding the duress defense but does not foreclose it either; the agency is free to retain that rule so long as the choice to do so is soundly reasoned, not based on irrelevant or arbitrary factors (like the Fedorenko precedent).

The primary contention to the contrary is, in short, that barring aliens who persecuted under duress would punish purely nonculpable conduct. That argument suffers from at least three unjustified leaps of logic.

First, it implicitly adopts a view of culpability that is neither the only view nor one necessarily applicable here. The culpability of one who harms another under coercion is, and has always been, a subject of intense debate, raising profound questions of moral philosophy and individual responsibility. (The so-called Nuremberg defense comes readily to mind.) At common law, duress was not an accepted defense to intentional killing, see 2 W. LaFave, Substantive Criminal Law §9.7(b), pp. 7475 (2d ed. 2003); and in modern times, some states do not allow it as a defense to lesser crimes, see id., at 8182, and n. 50. Notably, there is no historical support for the duress defense when a soldier follows a military order he knows to be unlawful. Id.,§9.7(g), at 86; see also, e.g., Axtells Case, Kel. J. 13,
84Eng. Rep.
1060 (1660); Prosecutor v. Erdemovi<f f="Century Schoolbook CE">, [1997] 2 ICTY Jud. Rep. 1610, 1635 (Intl Crim. Trib. for Former Yugoslavia). It is therefore far from clear that precluding a duress defense here would, as petitioner alleges, disregard principles of blame . . . universal and persistent in American law. Brief for Petitioner 32 (quoting Morissette v. United States,
342 U. S. 246,
250 (1952)
). All of this suggests that those who are coerced to commit wrong are at least sometimes culpable enough to be treated as criminals.

More importantly, this is not a criminal matter. This Court has long understood that an order of deportation is not a punishment for crime. Fong Yue Ting v. United States,
149 U. S. 698,
730 (1893)
. Asylum is a benefit accorded by grace, not by entitlement, and withholding that benefit from all who have intentionally harmed otherswhether under coercion or notis not unreasonable.

Second, petitioner assumes that the persecutor bar must have been intended merely to punish wrongdoing. But in the context of immigration law, culpability as a relevant factor in determining admissibility is only one facet of a more general consideration: desirability. And there may well be reasons to think that those who persecuted others, even under duress, would be relatively undesirable as immigrants. If, for example, the asylum laws grant entry to those who suffered the persecution, might it not be imprudent to also grant entry to the coerced persecutor, who may end up living in the same community as one of his victims? The Nation has a legitimate interest in preventing the importation of ethnic strife from remote parts of the world, and the agency may resolve the statutory ambiguity in a way that safeguards that interest.

Finally, even if culpability is the only relevant factor, and even if a narrow, criminal-law based view of culpability is the authoritative one, a bright-line rule excluding all persecutorswhether acting under coercion or notmight still be the best way for the agency to effectuate the statutory scheme. See generally Cox & Posner, Second-Order Structure of Immigration Law, 59 Stan. L. Rev. 809 (2007). Immigration judges already face the overwhelming task of attempting to recreate, by a limited number of witnesses speaking through (often poor-quality) translation, events that took place years ago in foreign, usually impoverished countries. See Dia v. Ashcroft, 353 F. 3d 228, 261262 (CA3 2003) (en banc) (Alito, J., concurring in part and dissenting in part). Adding on top of that the burden of adjudicating claims of duress and coercion, which are extremely difficult to corroborate and necessarily pose questions of degree that require intensely fact-bound line-drawing, would increase the already inherently high risk of error. And the cost of error (viz., allowing uncoerced persecutors to remain in the country permanently) might reasonably be viewed by the agency as significantly greater than the cost of overinclusion under a bright-line rule (viz., denial of asylum to some coerced persecutorswho might anyway be entitled to protection under the Convention Against Torture, which includes no analogous persecutor bar).

It is worth noting that although the agencys objective effects approach to the statute would seem to sweep beyond the duress scenario to encompass even an alien who had no idea that his actions would objectively assist in persecution, see Castańeda-Castillo v. Gonzales, 488 F. 3d 17, 20 (CA1 2007) (en banc), there is no reason why the agency cannot consider questions of knowledge separate and apart from questions of duress. Both can be said to relate to the mental state of the persecutor,** but they present different problems which can be grappled with separately. The agency need not provide an all-embracing answer, ibid., in the present case. It may evaluate problems one by one as they arise, and whatever it might decide about an unknowing persecutor is irrelevant to petitioner, who knew exactly what he was doing.

To be clear, I do not endorse any particular rule. It is to agency officials, not to the Members of this Court, that Congress has given discretion to choose among permissible interpretations of the statute. They deserve to be told clearly whether we are serious about allowing them to exercise that discretion, or are rather firing a warning shot across the bow.

Notes

** The rationale for the duress defense, however, is conventionally not that the defendant … somehow loses his mental capacity to commit the crime in question, but rather that even though he has done the act the crime requires and has the mental state which the crime requires, his conduct … is excused. 2 LaFave, supra, §9.7(a), at 73.

on writ of certiorari to the united states court ofappeals for the fifth circuit

[March 3, 2009]

Justice Scalia, with whom Justice Alito joins, concurring.

I agree with the Court that the statute has an ambiguity, ante, at 5, with respect to whether an alien who was coerced to assist in persecution is barred from obtaining asylum in the United States. I agree that the agency is entitled to answer that question. Ibid. See Chevron U. S. A. Inc. v. Natural Resources Defense Council, Inc.,
467 U. S. 837,
843 (1984)
. And I agree that a remand is in order, to give the agency an opportunity to clarify whether its affirmative answer was premised on an erroneous view that this Courts decision in Fedorenko v. United States,
449 U. S. 490 (1981)
, compelled it. Ante, at 11.

I would not agree to remand if I did not think that the agency has the option of adhering to its decision. The majority appears to leave that question undecided, ante, at 5 (reserving whether a particular agency interpretation is reasonable); two Justices forthrightly disagree and would require the agency to recognize at least some sort of duress exception, post, at 7 (Stevens, J., concurring in part and dissenting in part).

But good reasons for the agencys current practice existreasons adequate to satisfy the requirement that an agency act reasonably in choosing among various possible constructions of an ambiguous statute. The statute does not mandate the rule precluding the duress defense but does not foreclose it either; the agency is free to retain that rule so long as the choice to do so is soundly reasoned, not based on irrelevant or arbitrary factors (like the Fedorenko precedent).

The primary contention to the contrary is, in short, that barring aliens who persecuted under duress would punish purely nonculpable conduct. That argument suffers from at least three unjustified leaps of logic.

First, it implicitly adopts a view of culpability that is neither the only view nor one necessarily applicable here. The culpability of one who harms another under coercion is, and has always been, a subject of intense debate, raising profound questions of moral philosophy and individual responsibility. (The so-called Nuremberg defense comes readily to mind.) At common law, duress was not an accepted defense to intentional killing, see 2 W. LaFave, Substantive Criminal Law §9.7(b), pp. 7475 (2d ed. 2003); and in modern times, some states do not allow it as a defense to lesser crimes, see id., at 8182, and n. 50. Notably, there is no historical support for the duress defense when a soldier follows a military order he knows to be unlawful. Id.,§9.7(g), at 86; see also, e.g., Axtells Case, Kel. J. 13,
84Eng. Rep.
1060 (1660); Prosecutor v. Erdemovi<f f="Century Schoolbook CE">, [1997] 2 ICTY Jud. Rep. 1610, 1635 (Intl Crim. Trib. for Former Yugoslavia). It is therefore far from clear that precluding a duress defense here would, as petitioner alleges, disregard principles of blame . . . universal and persistent in American law. Brief for Petitioner 32 (quoting Morissette v. United States,
342 U. S. 246,
250 (1952)
). All of this suggests that those who are coerced to commit wrong are at least sometimes culpable enough to be treated as criminals.

More importantly, this is not a criminal matter. This Court has long understood that an order of deportation is not a punishment for crime. Fong Yue Ting v. United States,
149 U. S. 698,
730 (1893)
. Asylum is a benefit accorded by grace, not by entitlement, and withholding that benefit from all who have intentionally harmed otherswhether under coercion or notis not unreasonable.

Second, petitioner assumes that the persecutor bar must have been intended merely to punish wrongdoing. But in the context of immigration law, culpability as a relevant factor in determining admissibility is only one facet of a more general consideration: desirability. And there may well be reasons to think that those who persecuted others, even under duress, would be relatively undesirable as immigrants. If, for example, the asylum laws grant entry to those who suffered the persecution, might it not be imprudent to also grant entry to the coerced persecutor, who may end up living in the same community as one of his victims? The Nation has a legitimate interest in preventing the importation of ethnic strife from remote parts of the world, and the agency may resolve the statutory ambiguity in a way that safeguards that interest.

Finally, even if culpability is the only relevant factor, and even if a narrow, criminal-law based view of culpability is the authoritative one, a bright-line rule excluding all persecutorswhether acting under coercion or notmight still be the best way for the agency to effectuate the statutory scheme. See generally Cox & Posner, Second-Order Structure of Immigration Law, 59 Stan. L. Rev. 809 (2007). Immigration judges already face the overwhelming task of attempting to recreate, by a limited number of witnesses speaking through (often poor-quality) translation, events that took place years ago in foreign, usually impoverished countries. See Dia v. Ashcroft, 353 F. 3d 228, 261262 (CA3 2003) (en banc) (Alito, J., concurring in part and dissenting in part). Adding on top of that the burden of adjudicating claims of duress and coercion, which are extremely difficult to corroborate and necessarily pose questions of degree that require intensely fact-bound line-drawing, would increase the already inherently high risk of error. And the cost of error (viz., allowing uncoerced persecutors to remain in the country permanently) might reasonably be viewed by the agency as significantly greater than the cost of overinclusion under a bright-line rule (viz., denial of asylum to some coerced persecutorswho might anyway be entitled to protection under the Convention Against Torture, which includes no analogous persecutor bar).

It is worth noting that although the agencys objective effects approach to the statute would seem to sweep beyond the duress scenario to encompass even an alien who had no idea that his actions would objectively assist in persecution, see Castańeda-Castillo v. Gonzales, 488 F. 3d 17, 20 (CA1 2007) (en banc), there is no reason why the agency cannot consider questions of knowledge separate and apart from questions of duress. Both can be said to relate to the mental state of the persecutor,** but they present different problems which can be grappled with separately. The agency need not provide an all-embracing answer, ibid., in the present case. It may evaluate problems one by one as they arise, and whatever it might decide about an unknowing persecutor is irrelevant to petitioner, who knew exactly what he was doing.

To be clear, I do not endorse any particular rule. It is to agency officials, not to the Members of this Court, that Congress has given discretion to choose among permissible interpretations of the statute. They deserve to be told clearly whether we are serious about allowing them to exercise that discretion, or are rather firing a warning shot across the bow.

Notes

** The rationale for the duress defense, however, is conventionally not that the defendant … somehow loses his mental capacity to commit the crime in question, but rather that even though he has done the act the crime requires and has the mental state which the crime requires, his conduct … is excused. 2 LaFave, supra, §9.7(a), at 73.

on writ of certiorari to the united states court ofappeals for the fifth circuit

[March 3, 2009]

Justice Scalia, with whom Justice Alito joins, concurring.

I agree with the Court that the statute has an ambiguity, ante, at 5, with respect to whether an alien who was coerced to assist in persecution is barred from obtaining asylum in the United States. I agree that the agency is entitled to answer that question. Ibid. See Chevron U. S. A. Inc. v. Natural Resources Defense Council, Inc.,
467 U. S. 837,
843 (1984)
. And I agree that a remand is in order, to give the agency an opportunity to clarify whether its affirmative answer was premised on an erroneous view that this Courts decision in Fedorenko v. United States,
449 U. S. 490 (1981)
, compelled it. Ante, at 11.

I would not agree to remand if I did not think that the agency has the option of adhering to its decision. The majority appears to leave that question undecided, ante, at 5 (reserving whether a particular agency interpretation is reasonable); two Justices forthrightly disagree and would require the agency to recognize at least some sort of duress exception, post, at 7 (Stevens, J., concurring in part and dissenting in part).

But good reasons for the agencys current practice existreasons adequate to satisfy the requirement that an agency act reasonably in choosing among various possible constructions of an ambiguous statute. The statute does not mandate the rule precluding the duress defense but does not foreclose it either; the agency is free to retain that rule so long as the choice to do so is soundly reasoned, not based on irrelevant or arbitrary factors (like the Fedorenko precedent).

The primary contention to the contrary is, in short, that barring aliens who persecuted under duress would punish purely nonculpable conduct. That argument suffers from at least three unjustified leaps of logic.

First, it implicitly adopts a view of culpability that is neither the only view nor one necessarily applicable here. The culpability of one who harms another under coercion is, and has always been, a subject of intense debate, raising profound questions of moral philosophy and individual responsibility. (The so-called Nuremberg defense comes readily to mind.) At common law, duress was not an accepted defense to intentional killing, see 2 W. LaFave, Substantive Criminal Law §9.7(b), pp. 7475 (2d ed. 2003); and in modern times, some states do not allow it as a defense to lesser crimes, see id., at 8182, and n. 50. Notably, there is no historical support for the duress defense when a soldier follows a military order he knows to be unlawful. Id.,§9.7(g), at 86; see also, e.g., Axtells Case, Kel. J. 13,
84Eng. Rep.
1060 (1660); Prosecutor v. Erdemovi<f f="Century Schoolbook CE">, [1997] 2 ICTY Jud. Rep. 1610, 1635 (Intl Crim. Trib. for Former Yugoslavia). It is therefore far from clear that precluding a duress defense here would, as petitioner alleges, disregard principles of blame . . . universal and persistent in American law. Brief for Petitioner 32 (quoting Morissette v. United States,
342 U. S. 246,
250 (1952)
). All of this suggests that those who are coerced to commit wrong are at least sometimes culpable enough to be treated as criminals.

More importantly, this is not a criminal matter. This Court has long understood that an order of deportation is not a punishment for crime. Fong Yue Ting v. United States,
149 U. S. 698,
730 (1893)
. Asylum is a benefit accorded by grace, not by entitlement, and withholding that benefit from all who have intentionally harmed otherswhether under coercion or notis not unreasonable.

Second, petitioner assumes that the persecutor bar must have been intended merely to punish wrongdoing. But in the context of immigration law, culpability as a relevant factor in determining admissibility is only one facet of a more general consideration: desirability. And there may well be reasons to think that those who persecuted others, even under duress, would be relatively undesirable as immigrants. If, for example, the asylum laws grant entry to those who suffered the persecution, might it not be imprudent to also grant entry to the coerced persecutor, who may end up living in the same community as one of his victims? The Nation has a legitimate interest in preventing the importation of ethnic strife from remote parts of the world, and the agency may resolve the statutory ambiguity in a way that safeguards that interest.

Finally, even if culpability is the only relevant factor, and even if a narrow, criminal-law based view of culpability is the authoritative one, a bright-line rule excluding all persecutorswhether acting under coercion or notmight still be the best way for the agency to effectuate the statutory scheme. See generally Cox & Posner, Second-Order Structure of Immigration Law, 59 Stan. L. Rev. 809 (2007). Immigration judges already face the overwhelming task of attempting to recreate, by a limited number of witnesses speaking through (often poor-quality) translation, events that took place years ago in foreign, usually impoverished countries. See Dia v. Ashcroft, 353 F. 3d 228, 261262 (CA3 2003) (en banc) (Alito, J., concurring in part and dissenting in part). Adding on top of that the burden of adjudicating claims of duress and coercion, which are extremely difficult to corroborate and necessarily pose questions of degree that require intensely fact-bound line-drawing, would increase the already inherently high risk of error. And the cost of error (viz., allowing uncoerced persecutors to remain in the country permanently) might reasonably be viewed by the agency as significantly greater than the cost of overinclusion under a bright-line rule (viz., denial of asylum to some coerced persecutorswho might anyway be entitled to protection under the Convention Against Torture, which includes no analogous persecutor bar).

It is worth noting that although the agencys objective effects approach to the statute would seem to sweep beyond the duress scenario to encompass even an alien who had no idea that his actions would objectively assist in persecution, see Castańeda-Castillo v. Gonzales, 488 F. 3d 17, 20 (CA1 2007) (en banc), there is no reason why the agency cannot consider questions of knowledge separate and apart from questions of duress. Both can be said to relate to the mental state of the persecutor,** but they present different problems which can be grappled with separately. The agency need not provide an all-embracing answer, ibid., in the present case. It may evaluate problems one by one as they arise, and whatever it might decide about an unknowing persecutor is irrelevant to petitioner, who knew exactly what he was doing.

To be clear, I do not endorse any particular rule. It is to agency officials, not to the Members of this Court, that Congress has given discretion to choose among permissible interpretations of the statute. They deserve to be told clearly whether we are serious about allowing them to exercise that discretion, or are rather firing a warning shot across the bow.

Notes

** The rationale for the duress defense, however, is conventionally not that the defendant … somehow loses his mental capacity to commit the crime in question, but rather that even though he has done the act the crime requires and has the mental state which the crime requires, his conduct … is excused. 2 LaFave, supra, §9.7(a), at 73.

on writ of certiorari to the united states court ofappeals for the fifth circuit

[March 3, 2009]

Justice Scalia, with whom Justice Alito joins, concurring.

I agree with the Court that the statute has an ambiguity, ante, at 5, with respect to whether an alien who was coerced to assist in persecution is barred from obtaining asylum in the United States. I agree that the agency is entitled to answer that question. Ibid. See Chevron U. S. A. Inc. v. Natural Resources Defense Council, Inc.,
467 U. S. 837,
843 (1984)
. And I agree that a remand is in order, to give the agency an opportunity to clarify whether its affirmative answer was premised on an erroneous view that this Courts decision in Fedorenko v. United States,
449 U. S. 490 (1981)
, compelled it. Ante, at 11.

I would not agree to remand if I did not think that the agency has the option of adhering to its decision. The majority appears to leave that question undecided, ante, at 5 (reserving whether a particular agency interpretation is reasonable); two Justices forthrightly disagree and would require the agency to recognize at least some sort of duress exception, post, at 7 (Stevens, J., concurring in part and dissenting in part).

But good reasons for the agencys current practice existreasons adequate to satisfy the requirement that an agency act reasonably in choosing among various possible constructions of an ambiguous statute. The statute does not mandate the rule precluding the duress defense but does not foreclose it either; the agency is free to retain that rule so long as the choice to do so is soundly reasoned, not based on irrelevant or arbitrary factors (like the Fedorenko precedent).

The primary contention to the contrary is, in short, that barring aliens who persecuted under duress would punish purely nonculpable conduct. That argument suffers from at least three unjustified leaps of logic.

First, it implicitly adopts a view of culpability that is neither the only view nor one necessarily applicable here. The culpability of one who harms another under coercion is, and has always been, a subject of intense debate, raising profound questions of moral philosophy and individual responsibility. (The so-called Nuremberg defense comes readily to mind.) At common law, duress was not an accepted defense to intentional killing, see 2 W. LaFave, Substantive Criminal Law §9.7(b), pp. 7475 (2d ed. 2003); and in modern times, some states do not allow it as a defense to lesser crimes, see id., at 8182, and n. 50. Notably, there is no historical support for the duress defense when a soldier follows a military order he knows to be unlawful. Id.,§9.7(g), at 86; see also, e.g., Axtells Case, Kel. J. 13,
84Eng. Rep.
1060 (1660); Prosecutor v. Erdemovi<f f="Century Schoolbook CE">, [1997] 2 ICTY Jud. Rep. 1610, 1635 (Intl Crim. Trib. for Former Yugoslavia). It is therefore far from clear that precluding a duress defense here would, as petitioner alleges, disregard principles of blame . . . universal and persistent in American law. Brief for Petitioner 32 (quoting Morissette v. United States,
342 U. S. 246,
250 (1952)
). All of this suggests that those who are coerced to commit wrong are at least sometimes culpable enough to be treated as criminals.

More importantly, this is not a criminal matter. This Court has long understood that an order of deportation is not a punishment for crime. Fong Yue Ting v. United States,
149 U. S. 698,
730 (1893)
. Asylum is a benefit accorded by grace, not by entitlement, and withholding that benefit from all who have intentionally harmed otherswhether under coercion or notis not unreasonable.

Second, petitioner assumes that the persecutor bar must have been intended merely to punish wrongdoing. But in the context of immigration law, culpability as a relevant factor in determining admissibility is only one facet of a more general consideration: desirability. And there may well be reasons to think that those who persecuted others, even under duress, would be relatively undesirable as immigrants. If, for example, the asylum laws grant entry to those who suffered the persecution, might it not be imprudent to also grant entry to the coerced persecutor, who may end up living in the same community as one of his victims? The Nation has a legitimate interest in preventing the importation of ethnic strife from remote parts of the world, and the agency may resolve the statutory ambiguity in a way that safeguards that interest.

Finally, even if culpability is the only relevant factor, and even if a narrow, criminal-law based view of culpability is the authoritative one, a bright-line rule excluding all persecutorswhether acting under coercion or notmight still be the best way for the agency to effectuate the statutory scheme. See generally Cox & Posner, Second-Order Structure of Immigration Law, 59 Stan. L. Rev. 809 (2007). Immigration judges already face the overwhelming task of attempting to recreate, by a limited number of witnesses speaking through (often poor-quality) translation, events that took place years ago in foreign, usually impoverished countries. See Dia v. Ashcroft, 353 F. 3d 228, 261262 (CA3 2003) (en banc) (Alito, J., concurring in part and dissenting in part). Adding on top of that the burden of adjudicating claims of duress and coercion, which are extremely difficult to corroborate and necessarily pose questions of degree that require intensely fact-bound line-drawing, would increase the already inherently high risk of error. And the cost of error (viz., allowing uncoerced persecutors to remain in the country permanently) might reasonably be viewed by the agency as significantly greater than the cost of overinclusion under a bright-line rule (viz., denial of asylum to some coerced persecutorswho might anyway be entitled to protection under the Convention Against Torture, which includes no analogous persecutor bar).

It is worth noting that although the agencys objective effects approach to the statute would seem to sweep beyond the duress scenario to encompass even an alien who had no idea that his actions would objectively assist in persecution, see Castańeda-Castillo v. Gonzales, 488 F. 3d 17, 20 (CA1 2007) (en banc), there is no reason why the agency cannot consider questions of knowledge separate and apart from questions of duress. Both can be said to relate to the mental state of the persecutor,** but they present different problems which can be grappled with separately. The agency need not provide an all-embracing answer, ibid., in the present case. It may evaluate problems one by one as they arise, and whatever it might decide about an unknowing persecutor is irrelevant to petitioner, who knew exactly what he was doing.

To be clear, I do not endorse any particular rule. It is to agency officials, not to the Members of this Court, that Congress has given discretion to choose among permissible interpretations of the statute. They deserve to be told clearly whether we are serious about allowing them to exercise that discretion, or are rather firing a warning shot across the bow.

Notes

** The rationale for the duress defense, however, is conventionally not that the defendant … somehow loses his mental capacity to commit the crime in question, but rather that even though he has done the act the crime requires and has the mental state which the crime requires, his conduct … is excused. 2 LaFave, supra, §9.7(a), at 73.

on writ of certiorari to the united states court ofappeals for the fifth circuit

[March 3, 2009]

Justice Scalia, with whom Justice Alito joins, concurring.

I agree with the Court that the statute has an ambiguity, ante, at 5, with respect to whether an alien who was coerced to assist in persecution is barred from obtaining asylum in the United States. I agree that the agency is entitled to answer that question. Ibid. See Chevron U. S. A. Inc. v. Natural Resources Defense Council, Inc.,
467 U. S. 837,
843 (1984)
. And I agree that a remand is in order, to give the agency an opportunity to clarify whether its affirmative answer was premised on an erroneous view that this Courts decision in Fedorenko v. United States,
449 U. S. 490 (1981)
, compelled it. Ante, at 11.

I would not agree to remand if I did not think that the agency has the option of adhering to its decision. The majority appears to leave that question undecided, ante, at 5 (reserving whether a particular agency interpretation is reasonable); two Justices forthrightly disagree and would require the agency to recognize at least some sort of duress exception, post, at 7 (Stevens, J., concurring in part and dissenting in part).

But good reasons for the agencys current practice existreasons adequate to satisfy the requirement that an agency act reasonably in choosing among various possible constructions of an ambiguous statute. The statute does not mandate the rule precluding the duress defense but does not foreclose it either; the agency is free to retain that rule so long as the choice to do so is soundly reasoned, not based on irrelevant or arbitrary factors (like the Fedorenko precedent).

The primary contention to the contrary is, in short, that barring aliens who persecuted under duress would punish purely nonculpable conduct. That argument suffers from at least three unjustified leaps of logic.

First, it implicitly adopts a view of culpability that is neither the only view nor one necessarily applicable here. The culpability of one who harms another under coercion is, and has always been, a subject of intense debate, raising profound questions of moral philosophy and individual responsibility. (The so-called Nuremberg defense comes readily to mind.) At common law, duress was not an accepted defense to intentional killing, see 2 W. LaFave, Substantive Criminal Law §9.7(b), pp. 7475 (2d ed. 2003); and in modern times, some states do not allow it as a defense to lesser crimes, see id., at 8182, and n. 50. Notably, there is no historical support for the duress defense when a soldier follows a military order he knows to be unlawful. Id.,§9.7(g), at 86; see also, e.g., Axtells Case, Kel. J. 13,
84Eng. Rep.
1060 (1660); Prosecutor v. Erdemovi<f f="Century Schoolbook CE">, [1997] 2 ICTY Jud. Rep. 1610, 1635 (Intl Crim. Trib. for Former Yugoslavia). It is therefore far from clear that precluding a duress defense here would, as petitioner alleges, disregard principles of blame . . . universal and persistent in American law. Brief for Petitioner 32 (quoting Morissette v. United States,
342 U. S. 246,
250 (1952)
). All of this suggests that those who are coerced to commit wrong are at least sometimes culpable enough to be treated as criminals.

More importantly, this is not a criminal matter. This Court has long understood that an order of deportation is not a punishment for crime. Fong Yue Ting v. United States,
149 U. S. 698,
730 (1893)
. Asylum is a benefit accorded by grace, not by entitlement, and withholding that benefit from all who have intentionally harmed otherswhether under coercion or notis not unreasonable.

Second, petitioner assumes that the persecutor bar must have been intended merely to punish wrongdoing. But in the context of immigration law, culpability as a relevant factor in determining admissibility is only one facet of a more general consideration: desirability. And there may well be reasons to think that those who persecuted others, even under duress, would be relatively undesirable as immigrants. If, for example, the asylum laws grant entry to those who suffered the persecution, might it not be imprudent to also grant entry to the coerced persecutor, who may end up living in the same community as one of his victims? The Nation has a legitimate interest in preventing the importation of ethnic strife from remote parts of the world, and the agency may resolve the statutory ambiguity in a way that safeguards that interest.

Finally, even if culpability is the only relevant factor, and even if a narrow, criminal-law based view of culpability is the authoritative one, a bright-line rule excluding all persecutorswhether acting under coercion or notmight still be the best way for the agency to effectuate the statutory scheme. See generally Cox & Posner, Second-Order Structure of Immigration Law, 59 Stan. L. Rev. 809 (2007). Immigration judges already face the overwhelming task of attempting to recreate, by a limited number of witnesses speaking through (often poor-quality) translation, events that took place years ago in foreign, usually impoverished countries. See Dia v. Ashcroft, 353 F. 3d 228, 261262 (CA3 2003) (en banc) (Alito, J., concurring in part and dissenting in part). Adding on top of that the burden of adjudicating claims of duress and coercion, which are extremely difficult to corroborate and necessarily pose questions of degree that require intensely fact-bound line-drawing, would increase the already inherently high risk of error. And the cost of error (viz., allowing uncoerced persecutors to remain in the country permanently) might reasonably be viewed by the agency as significantly greater than the cost of overinclusion under a bright-line rule (viz., denial of asylum to some coerced persecutorswho might anyway be entitled to protection under the Convention Against Torture, which includes no analogous persecutor bar).

It is worth noting that although the agencys objective effects approach to the statute would seem to sweep beyond the duress scenario to encompass even an alien who had no idea that his actions would objectively assist in persecution, see Castańeda-Castillo v. Gonzales, 488 F. 3d 17, 20 (CA1 2007) (en banc), there is no reason why the agency cannot consider questions of knowledge separate and apart from questions of duress. Both can be said to relate to the mental state of the persecutor,** but they present different problems which can be grappled with separately. The agency need not provide an all-embracing answer, ibid., in the present case. It may evaluate problems one by one as they arise, and whatever it might decide about an unknowing persecutor is irrelevant to petitioner, who knew exactly what he was doing.

To be clear, I do not endorse any particular rule. It is to agency officials, not to the Members of this Court, that Congress has given discretion to choose among permissible interpretations of the statute. They deserve to be told clearly whether we are serious about allowing them to exercise that discretion, or are rather firing a warning shot across the bow.

Notes

** The rationale for the duress defense, however, is conventionally not that the defendant … somehow loses his mental capacity to commit the crime in question, but rather that even though he has done the act the crime requires and has the mental state which the crime requires, his conduct … is excused. 2 LaFave, supra, §9.7(a), at 73.

on writ of certiorari to the united states court ofappeals for the fifth circuit

[March 3, 2009]

Justice Stevens, with whom Justice Breyer joins, concurring in part and dissenting in part.

The narrow question of statutory construction presented by this case is whether the so-called persecutor bar,
8 U. S. C. §§1101(a)(42), disqualifies from asylum or withholding of removal an alien whose conduct was coerced or otherwise the product of duress. If the answer to that threshold question is no, courts should defer to the Attorney Generals evaluation of particular circumstances that may or may not establish duress or coercion in individual cases. But the threshold question the Court addresses today is a pure question of statutory construction for the courts to decide. INS v. Cardoza-Fonseca,
480 U. S. 421,
446 (1987)
. For that reason, while I agree with the Courts cogent explanation of why its misguided decision in Fedorenko v. United States,
449 U. S. 490 (1981)
, does not govern our interpretation of the persecutor bar, I would provide a definite answer to the question presented and then remand for further proceedings.

I

Judicial deference to agencies views on statutes they administer was not born in Chevron U. S. A. Inc. v. Natural Resources Defense Council, Inc.,
467 U. S. 837 (1984)
, nor did the singularly judicial role of marking the boundaries of agency choice, Young v. Community Nutrition Institute,
476 U. S. 974,
988 (1986)
(Stevens, J., dissenting), die with that case. In the years before Chevron, this Court recognized that statutory interpretation is a multifaceted enterprise, ranging from a precise construction of statutory language to a determination of what policy best effectuates statutory objectives. We accordingly acknowledged that a complete interpretation of a statutory provision might demand both judicial construction and administrative explication. E.g., NLRB v. Hearst Publications, Inc.,
322 U. S. 111 (1944)
(construing the term employee in the National Labor Relations Act but deferring to the National Labor Relations Boards finding that newsboys were employees); see Nathanson, Administrative Discretion in the Interpretation of Statutes, 3 Vand. L. Rev. 470 (1950).

Chevron adhered to this approach. There, we recognized that the Clean Air Act did not define stationary source,
42 U. S. C. §7502(b)(6) (1982 ed.), but rather implicitly delegated to the Environmental Protection Agency (EPA) the policy question whether States could treat entire plants or only their discrete pollution-emitting devices as sources of pollution for purposes of the Acts permit program. Congress left a gap for the agency to fill, and the agency brought its expertise, political acuity, and information-gathering abilities to bear in doing so.See Chevron, 467 U. S., at 865866.1 In keeping with precedent, see id., at 843845, and nn. 9, 1114, our opinion reaffirmed both that [t]he judiciary is the final authority on issues of statutory construction, id., at 843, n. 9, and that courts should defer to an agencys reasonable formulation of policy in response to an explicit or implicit congressional delegation of authority. The Chevron framework thus accounts for the different institutional competencies of agencies and courts: Courts are expert at statutory construction, while agencies are expert at statutory implementation. That the distinction can be subtle does not lessen its importance.

In the 25 years since Chevron was decided, this Court has continued to recognize that courts and agencies play complementary roles in the project of statutory interpretation. We have repeatedly held that ambiguities in statutes within an agencys jurisdiction to administer are delegations of authority to the agency to fill the statutory gap in reasonable fashion. National Cable & Telecommunications Assn. v. Brand X Internet Services,
545 U. S. 967,
980 (2005)
. But even when confronted with a statute that involves a degree of ambiguityas most statutes dowe have not abdicated our judicial role. The fact that Congress has left a gap for the agency to fill means that courts should defer to the agencys reasonable gap-filling decisions, not that courts should cease to mark the bounds of delegated agency choice.2

In cases involving agency adjudication, we have sometimes described the courts role as deciding pure questions of statutory construction and the agencys role as applying law to fact. See, e.g., Cardoza-Fonseca,
480 U. S. 421; NLRB v. Food & Commercial Workers,
484 U. S. 112 (1987)
; see also Republic of Austria v. Altmann,
541 U. S. 677,
701702 (2004)
. While this phrasing is peculiar to the adjudicatory context, the principle applies to Chevrons domain more broadly. In the context of agency rulemaking, for instance, we might distinguish between pure questions of statutory interpretation and policymaking, or between central legal issues and interstitial questions. See Barnhart v. Walton,
535 U. S. 212,
222 (2002)
.3 The label is immaterial. What matters is the principle: Certain aspects of statutory interpretation remain within the purview of the courts, even when the statute is not entirely clear, while others are properly understood as delegated by Congress to an expert and accountable administrative body. Statutory language may thus admit of both judicial construction and agency exposition.

II

Two of this Courts cases construing the Immigration and Nationality Act (INA),
66Stat.
166,
8 U. S. C. §1101et seq., illustrate the proper division of responsibility between courts and agencies and highlight when Chevron deference is appropriate and when it is not. In Cardoza-Fonseca,the question was whether the standard of INA §243(h),
8 U. S. C. §1253(h) (1982 ed.), which requires an alien to show that she is more likely than not to be subject to persecution if she is deported, also governs applications for asylum under §208(a),
8 U. S. C. §1158(a) (1982 ed.), which authorizes the Attorney General to grant asylum to an alien who has a well-founded fear of persecution in her home country. After considering the INAs language, its legislative history, and the United Nations Protocol that Congress had implemented, the Court determined that the two standards are not the same.

In so holding, we decisively rejected the Governments contention, echoed by Justice Scalias concurrence in the judgment, that the Board of Immigration Appeals (BIA) interpretation of the statute merited deference under our then-recent decision in Chevron. The question whether Congress intended the two standards to be identical is a pure question of statutory construction for the courts to decide, we stated. 480 U. S., at 446. We therefore did not defer to the BIAs interpretation of the two standards as equivalent but instead employed traditional tools of statutory construction and concluded that Congress did not intend the two standards to be identical. Ibid.4

Importantly, we recognized that Chevron deference need not be an all-or-nothing venture. Even after the question of the standards equivalency was resolved, there remained the question of their application. We explained, The narrow legal question whether the two standards are the same is, of course, quite different from the question of interpretation that arises in each case in which the agency is required to apply either or both standards to a particular set of facts. 480 U. S., at 448. And we noted that applying the INA was a task particularly suited to the agencys unique competencies:There is obviously some ambiguity in a term like well-founded fear which can only be given concrete meaning through a process of case-by-case adjudication. In that process of filling  any gap left, implicitly or explicitly by Congress,  the courts must respect the interpretation of the agency to which Congress has delegated the responsibility for administering the statutory program. Ibid. (quoting Chevron, 467 U. S., at 843, in turn quoting Morton v. Ruiz,
415 U. S. 199,
231 (1974)
).

In INS v. Aguirre-Aguirre,
526 U. S. 415 (1999)
, the Court encountered just the type of agency decision Cardoza-Fonseca indicated would warrant Chevron deference. The BIA had denied withholding of deportation because it found that the respondent had committed a serious nonpolitical crime before he entered the United States,
8 U. S. C. §1253(h)(2)(C) (1994 ed.). The Court of Appeals reversed the agencys decision and required it to supplement its balancing test with specific additional factors (such as whether the respondents acts were grossly out of proportion to their objective and whether the acts were politically necessary and successful).

We reversed the Court of Appeals, concluding that Chevron deference should be accorded to the BIA as it gives ambiguous statutory terms concrete meaning through a process of case-by-case adjudication.  526 U. S., at 425 (quoting Cardoza-Fonseca,480 U. S., at 448). The BIAs formulation of a test to apply the statutory standard in individual cases and its application of that test in respondents case were precisely the sort of agency actions that merited judicial deference.

III

The threshold question the Court addresses today is the kind of pure question of statutory construction for the courts to decide that we answered in Cardoza-Fonseca, id., at 446, rather than a fact-intensive question of the kind we addressed in Aguirre-Aguirre. Just as we decided the narrow legal question presented in Cardoza-Fonseca but did not attempt to set forth a detailed description of how the well-founded fear test should be applied, 480 U. S., at 448, I would decide the narrow legal question now before us and remand for the agency to determine how the persecutor bar applies in individual cases.5

For reasons similar to those set forth in my dissent in Fedorenko, I think it plain that the persecutor bar does not disqualify from asylum or withholding of removal an alien whose conduct was coerced or otherwise the product of duress. Although I agree in full with the Courts conclusion that the majority opinion in Fedorenko does not govern our interpretation of the persecutor bar, the differences the Court highlights between the Displaced Persons Act of 1948 (DPA),
62Stat.
1009, and the Refugee Act of 1980,
94Stat.
102, only strengthen my conclusion that voluntary assistance in persecution is required and that duress and coercion vitiate voluntariness.

The Fedorenko Courts construction of the DPA threatened to exclude from the United States concentration camp prisoners who were forced to assist the Nazis in the persecution of other prisoners. In my view, this construction was insupportablethe DPAs exclusion of persons who assisted the enemy in persecuting civil populations, Constitution of the International Refugee Organization, Annex I, Part II, §2(a),
62Stat.
3051, did not extend to concentration camp prisoners who did so involuntarily. These prisoners were victims, not persecutors.

Without an exception for involuntary action, the Refugee Acts bar would similarly treat entire classes of victims as persecutors. The Act does not support such a reading. The language of the persecutor bar is most naturally read to denote culpable conduct, and this reading is powerfully supported by the statutory context and legislative history.

As this Court has previously recognizedand as the majority acknowledges again todayCongress passed the Refugee Act to implement the United Nations Convention Relating to the Status of Refugees, 189 U. N. T. S. 150 (July 28, 1951) (hereinafter Convention), reprinted in 19 U. S. T. 6259, and the 1967 United Nations Protocol Relating to the Status of Refugees, Jan. 31, 1967, [1968] 19 U. S. T. 6223, T. I. A. S. No. 6577 (hereinafter Protocol). These treaties place a mandatory obligation on signatory states not to expel or return (refouler) a refugee in any manner whatsoever to … territories where his life or freedom would be threatened on account of his race, religion, nationality, membership of a particular social group or political opinion. Convention, Art. 33(1), 19 U. S. T., at 6276; Protocol, Art. I, 19 U. S. T., at 6225. The Refugee Acts withholding of removal provision specifically tracks this language.
8 U. S. C. §1231(b)(3)(A); see H. R. Rep. No. 96608, p. 18 (1979) (withholding of removal provision clearly reflects our legal obligations under international agreements, specifically Convention Article 33).6

The Convention excludes from the nonrefoulement obligation of Article 33 persons who have committed a crime against peace, a war crime, or a crime against humanity. Convention, Art. 1(F)(a), 19 U. S. T., at 6263. It is this exception that the persecutor bar reflects. See, e.g., H. R. Rep. No. 96608, at 18 (persecutor bar encompasses exceptions … provided in the Convention relating to aliens who have themselves participated in persecution); H. R. Conf. Rep. No. 96781, p. 20 (1980). The language of the Conventions exception is critical: We do not normally convict individuals of crimes when their actions are coerced or otherwise involuntary. Indeed, the United Nations Handbook, to which the Court has looked for guidance in the past, states that all relevant factors, including mitigating circumstances, must be considered in determining whether an aliens acts are of a criminal nature as contemplated by Article 1(F). Office of the United Nations High Commissioner for Refugees, Handbook on Procedures and Criteria for Determining Refugee Status ¶¶157, 162 (reedited Jan. 1992). Other states parties to the Convention and Protocol likewise read the Conventions exception as limited to culpable conduct.7 When we interpret treaties, we consider the interpretations of the courts of other nations, and we should do the same when Congress asks us to interpret a statute in light of a treatys language. See Zicherman v. Korean Air Lines Co.,
516 U. S. 217,
226228 (1996)
. Congress effort to conform United States law to the standard set forth in the U. N. Convention and Protocol shows that it intended the persecutor bar to apply only to culpable, voluntary actsand it underscores that Congress did not delegate the question presented by this case to the agency.

While I would hold that the persecutor bar does not automatically disqualify from asylum or withholding of removal an alien who acted involuntarily,8 I would leave for the Attorney Generaland, through his own delegation, the BIAthe question how the voluntariness standard should be applied. The agency would retain the ability, for instance, to define duress and coercion; to determine whether or not a balancing test should be employed; and, of course, to decide whether any individual asylum-seekers acts were covered by the persecutor bar. Those are the sorts of questions suited to the agencys unique competencies in administering the INA. The threshold question before the Court is not.

IV

Because I remain convinced that the narrower interpretation of Chevron endorsed by the Court in Cardoza-Fonseca was more faithful to the rationale of that case than the broader view the Court adopts today, I am unable to join its opinion. I would answer the question of law that this case presents with an unequivocal no and remand to the agency for further proceedings.

Notes

1 Notably, the EPA cast its activity not as statutory construction but as public administration; its rulemaking sought to achieve policy goals, such as reducing regulatory complexity and promoting plant modernization. See
46Fed. Reg.
50766 (1981). To be sure, the EPA argued that its regulation defining stationary source as an entire plant was permissible under the Clean Air Act, but the agency treated its rulemaking as a matter of fashioning sound policy, not of discerning the meaning of stationary source in the statute.

2 Cf. United States v. Mead Corp.,
533 U. S. 218,
236238 (2001)
; Barnhart v. Walton,
535 U. S. 212,
222 (2002)
(noting that Mead indicated that whether a court should give [Chevron] deference depends in significant part upon the interpretive method used and the nature of the question at issue).

3 The Administrative Procedure Act draws a similar distinction in providing that courts shall decide all relevant questions of law [and] interpret constitutional and statutory provisions but shall review agency action, findings, and conclusions under the arbitrary and capricious/abuse of discretion standard.
5 U. S. C. §706.

4 Justice Scalia objected in particular to the majoritys holding that pure questions of statutory construction are for the courts, not agencies, to decide; he insisted this was unfaithful to Chevron, since in Chevron the Court deferred to the Environmental Protection Agencys abstract interpretation of the phrase stationary source.  480 U. S., at 455 (opinion concurring in judgment). The majority rejected Justice Scalias argument, recognizing that Chevron involved an agencys complex policy judgment about how to fill a statutory gap, not a pure question of statutory construction. See 480 U. S., at 445448, and n. 29 (quoting extensively from Chevron).

5 The majority suggests that this approach is inconsistent with the  ordinary remand rule  articulated in Gonzales v. Thomas,
547 U. S. 183 (2006)
(per curiam), and INS v. Orlando Ventura,
537 U. S. 12 (2002)
(per curiam). Ante, at 1112. But those cases involved exactly the sort of application of law to fact that is within the agencys purview. In Thomas, the Court of Appeals decided that the family at issue fell within the scope of the statutory term particular social group.  547 U. S., at 185. We noted that the BIA had not considered this question, which require[d] determining the facts and deciding whether the facts as found f[e]ll within a statutory term. Id., at 186. Accordingly, we held that the court should have remanded to the agency. Similarly, in Ventura, the Court of Appeals addressed an issue that the BIA had not reached and concluded that conditions in Guatemala had so improved that no realistic threat of persecution currently existed. The Government argued that the court had not respected the BIAs role as fact-finder, 537 U. S., at 16, and we agreed, reversing the courts judgment insofar as it had not remanded to the agency.

6 Asylum and withholding of removal address concerns different from those addressed by the Convention Against Torture and Other Cruel, Inhuman, or Degrading Treatment or Punishment (CAT) and its implementing regulations. CAT, Dec. 10, 1984, S. Treaty Doc. No. 10020 (1988), 1465 U. N. T. S. 85; 8 CFR §§1208.161208.18 (2008). The CAT prohibits a state party from returning any person to a country where there is substantial reason to believe he might be tortured, but its definition of torture covers a narrower class of harms, imposed by a narrower class of actors, than the asylum and witholding of removal provisions. Most importantly, the CAT limits its definition of torture to acts inflicted by or at the instigation of or with the consent or acquiescence of a public official or other person acting in an official capacity, Pt. I, Art. 1, ¶1, p. 19, while asylum and withholding of removal are available to victims of harm inflicted by private actors, without regard to state involvement, see, e.g., In re Kasinga, 21 I. & N. Dec. 357, 365 (BIA 1996); In re H, 21 I. & N. Dec. 337, 343344 (BIA 1996).

8 Other considerations that are not presented in this case, such as an aliens lack of knowledge that he was involved in a persecutory act, could likewise indicate that he did not act with the requisite culpability. See, e.g., Castańeda-Castillo v. Gonzales, 488 F. 3d 17, 2022 (CA1 2007) (en banc); Hernandez v. Reno, 258 F. 3d 806, 814 (CA8 2001).

on writ of certiorari to the united states court ofappeals for the fifth circuit

[March 3, 2009]

Justice Stevens, with whom Justice Breyer joins, concurring in part and dissenting in part.

The narrow question of statutory construction presented by this case is whether the so-called persecutor bar,
8 U. S. C. §§1101(a)(42), disqualifies from asylum or withholding of removal an alien whose conduct was coerced or otherwise the product of duress. If the answer to that threshold question is no, courts should defer to the Attorney Generals evaluation of particular circumstances that may or may not establish duress or coercion in individual cases. But the threshold question the Court addresses today is a pure question of statutory construction for the courts to decide. INS v. Cardoza-Fonseca,
480 U. S. 421,
446 (1987)
. For that reason, while I agree with the Courts cogent explanation of why its misguided decision in Fedorenko v. United States,
449 U. S. 490 (1981)
, does not govern our interpretation of the persecutor bar, I would provide a definite answer to the question presented and then remand for further proceedings.

I

Judicial deference to agencies views on statutes they administer was not born in Chevron U. S. A. Inc. v. Natural Resources Defense Council, Inc.,
467 U. S. 837 (1984)
, nor did the singularly judicial role of marking the boundaries of agency choice, Young v. Community Nutrition Institute,
476 U. S. 974,
988 (1986)
(Stevens, J., dissenting), die with that case. In the years before Chevron, this Court recognized that statutory interpretation is a multifaceted enterprise, ranging from a precise construction of statutory language to a determination of what policy best effectuates statutory objectives. We accordingly acknowledged that a complete interpretation of a statutory provision might demand both judicial construction and administrative explication. E.g., NLRB v. Hearst Publications, Inc.,
322 U. S. 111 (1944)
(construing the term employee in the National Labor Relations Act but deferring to the National Labor Relations Boards finding that newsboys were employees); see Nathanson, Administrative Discretion in the Interpretation of Statutes, 3 Vand. L. Rev. 470 (1950).

Chevron adhered to this approach. There, we recognized that the Clean Air Act did not define stationary source,
42 U. S. C. §7502(b)(6) (1982 ed.), but rather implicitly delegated to the Environmental Protection Agency (EPA) the policy question whether States could treat entire plants or only their discrete pollution-emitting devices as sources of pollution for purposes of the Acts permit program. Congress left a gap for the agency to fill, and the agency brought its expertise, political acuity, and information-gathering abilities to bear in doing so.See Chevron, 467 U. S., at 865866.1 In keeping with precedent, see id., at 843845, and nn. 9, 1114, our opinion reaffirmed both that [t]he judiciary is the final authority on issues of statutory construction, id., at 843, n. 9, and that courts should defer to an agencys reasonable formulation of policy in response to an explicit or implicit congressional delegation of authority. The Chevron framework thus accounts for the different institutional competencies of agencies and courts: Courts are expert at statutory construction, while agencies are expert at statutory implementation. That the distinction can be subtle does not lessen its importance.

In the 25 years since Chevron was decided, this Court has continued to recognize that courts and agencies play complementary roles in the project of statutory interpretation. We have repeatedly held that ambiguities in statutes within an agencys jurisdiction to administer are delegations of authority to the agency to fill the statutory gap in reasonable fashion. National Cable & Telecommunications Assn. v. Brand X Internet Services,
545 U. S. 967,
980 (2005)
. But even when confronted with a statute that involves a degree of ambiguityas most statutes dowe have not abdicated our judicial role. The fact that Congress has left a gap for the agency to fill means that courts should defer to the agencys reasonable gap-filling decisions, not that courts should cease to mark the bounds of delegated agency choice.2

In cases involving agency adjudication, we have sometimes described the courts role as deciding pure questions of statutory construction and the agencys role as applying law to fact. See, e.g., Cardoza-Fonseca,
480 U. S. 421; NLRB v. Food & Commercial Workers,
484 U. S. 112 (1987)
; see also Republic of Austria v. Altmann,
541 U. S. 677,
701702 (2004)
. While this phrasing is peculiar to the adjudicatory context, the principle applies to Chevrons domain more broadly. In the context of agency rulemaking, for instance, we might distinguish between pure questions of statutory interpretation and policymaking, or between central legal issues and interstitial questions. See Barnhart v. Walton,
535 U. S. 212,
222 (2002)
.3 The label is immaterial. What matters is the principle: Certain aspects of statutory interpretation remain within the purview of the courts, even when the statute is not entirely clear, while others are properly understood as delegated by Congress to an expert and accountable administrative body. Statutory language may thus admit of both judicial construction and agency exposition.

II

Two of this Courts cases construing the Immigration and Nationality Act (INA),
66Stat.
166,
8 U. S. C. §1101et seq., illustrate the proper division of responsibility between courts and agencies and highlight when Chevron deference is appropriate and when it is not. In Cardoza-Fonseca,the question was whether the standard of INA §243(h),
8 U. S. C. §1253(h) (1982 ed.), which requires an alien to show that she is more likely than not to be subject to persecution if she is deported, also governs applications for asylum under §208(a),
8 U. S. C. §1158(a) (1982 ed.), which authorizes the Attorney General to grant asylum to an alien who has a well-founded fear of persecution in her home country. After considering the INAs language, its legislative history, and the United Nations Protocol that Congress had implemented, the Court determined that the two standards are not the same.

In so holding, we decisively rejected the Governments contention, echoed by Justice Scalias concurrence in the judgment, that the Board of Immigration Appeals (BIA) interpretation of the statute merited deference under our then-recent decision in Chevron. The question whether Congress intended the two standards to be identical is a pure question of statutory construction for the courts to decide, we stated. 480 U. S., at 446. We therefore did not defer to the BIAs interpretation of the two standards as equivalent but instead employed traditional tools of statutory construction and concluded that Congress did not intend the two standards to be identical. Ibid.4

Importantly, we recognized that Chevron deference need not be an all-or-nothing venture. Even after the question of the standards equivalency was resolved, there remained the question of their application. We explained, The narrow legal question whether the two standards are the same is, of course, quite different from the question of interpretation that arises in each case in which the agency is required to apply either or both standards to a particular set of facts. 480 U. S., at 448. And we noted that applying the INA was a task particularly suited to the agencys unique competencies:There is obviously some ambiguity in a term like well-founded fear which can only be given concrete meaning through a process of case-by-case adjudication. In that process of filling  any gap left, implicitly or explicitly by Congress,  the courts must respect the interpretation of the agency to which Congress has delegated the responsibility for administering the statutory program. Ibid. (quoting Chevron, 467 U. S., at 843, in turn quoting Morton v. Ruiz,
415 U. S. 199,
231 (1974)
).

In INS v. Aguirre-Aguirre,
526 U. S. 415 (1999)
, the Court encountered just the type of agency decision Cardoza-Fonseca indicated would warrant Chevron deference. The BIA had denied withholding of deportation because it found that the respondent had committed a serious nonpolitical crime before he entered the United States,
8 U. S. C. §1253(h)(2)(C) (1994 ed.). The Court of Appeals reversed the agencys decision and required it to supplement its balancing test with specific additional factors (such as whether the respondents acts were grossly out of proportion to their objective and whether the acts were politically necessary and successful).

We reversed the Court of Appeals, concluding that Chevron deference should be accorded to the BIA as it gives ambiguous statutory terms concrete meaning through a process of case-by-case adjudication.  526 U. S., at 425 (quoting Cardoza-Fonseca,480 U. S., at 448). The BIAs formulation of a test to apply the statutory standard in individual cases and its application of that test in respondents case were precisely the sort of agency actions that merited judicial deference.

III

The threshold question the Court addresses today is the kind of pure question of statutory construction for the courts to decide that we answered in Cardoza-Fonseca, id., at 446, rather than a fact-intensive question of the kind we addressed in Aguirre-Aguirre. Just as we decided the narrow legal question presented in Cardoza-Fonseca but did not attempt to set forth a detailed description of how the well-founded fear test should be applied, 480 U. S., at 448, I would decide the narrow legal question now before us and remand for the agency to determine how the persecutor bar applies in individual cases.5

For reasons similar to those set forth in my dissent in Fedorenko, I think it plain that the persecutor bar does not disqualify from asylum or withholding of removal an alien whose conduct was coerced or otherwise the product of duress. Although I agree in full with the Courts conclusion that the majority opinion in Fedorenko does not govern our interpretation of the persecutor bar, the differences the Court highlights between the Displaced Persons Act of 1948 (DPA),
62Stat.
1009, and the Refugee Act of 1980,
94Stat.
102, only strengthen my conclusion that voluntary assistance in persecution is required and that duress and coercion vitiate voluntariness.

The Fedorenko Courts construction of the DPA threatened to exclude from the United States concentration camp prisoners who were forced to assist the Nazis in the persecution of other prisoners. In my view, this construction was insupportablethe DPAs exclusion of persons who assisted the enemy in persecuting civil populations, Constitution of the International Refugee Organization, Annex I, Part II, §2(a),
62Stat.
3051, did not extend to concentration camp prisoners who did so involuntarily. These prisoners were victims, not persecutors.

Without an exception for involuntary action, the Refugee Acts bar would similarly treat entire classes of victims as persecutors. The Act does not support such a reading. The language of the persecutor bar is most naturally read to denote culpable conduct, and this reading is powerfully supported by the statutory context and legislative history.

As this Court has previously recognizedand as the majority acknowledges again todayCongress passed the Refugee Act to implement the United Nations Convention Relating to the Status of Refugees, 189 U. N. T. S. 150 (July 28, 1951) (hereinafter Convention), reprinted in 19 U. S. T. 6259, and the 1967 United Nations Protocol Relating to the Status of Refugees, Jan. 31, 1967, [1968] 19 U. S. T. 6223, T. I. A. S. No. 6577 (hereinafter Protocol). These treaties place a mandatory obligation on signatory states not to expel or return (refouler) a refugee in any manner whatsoever to … territories where his life or freedom would be threatened on account of his race, religion, nationality, membership of a particular social group or political opinion. Convention, Art. 33(1), 19 U. S. T., at 6276; Protocol, Art. I, 19 U. S. T., at 6225. The Refugee Acts withholding of removal provision specifically tracks this language.
8 U. S. C. §1231(b)(3)(A); see H. R. Rep. No. 96608, p. 18 (1979) (withholding of removal provision clearly reflects our legal obligations under international agreements, specifically Convention Article 33).6

The Convention excludes from the nonrefoulement obligation of Article 33 persons who have committed a crime against peace, a war crime, or a crime against humanity. Convention, Art. 1(F)(a), 19 U. S. T., at 6263. It is this exception that the persecutor bar reflects. See, e.g., H. R. Rep. No. 96608, at 18 (persecutor bar encompasses exceptions … provided in the Convention relating to aliens who have themselves participated in persecution); H. R. Conf. Rep. No. 96781, p. 20 (1980). The language of the Conventions exception is critical: We do not normally convict individuals of crimes when their actions are coerced or otherwise involuntary. Indeed, the United Nations Handbook, to which the Court has looked for guidance in the past, states that all relevant factors, including mitigating circumstances, must be considered in determining whether an aliens acts are of a criminal nature as contemplated by Article 1(F). Office of the United Nations High Commissioner for Refugees, Handbook on Procedures and Criteria for Determining Refugee Status ¶¶157, 162 (reedited Jan. 1992). Other states parties to the Convention and Protocol likewise read the Conventions exception as limited to culpable conduct.7 When we interpret treaties, we consider the interpretations of the courts of other nations, and we should do the same when Congress asks us to interpret a statute in light of a treatys language. See Zicherman v. Korean Air Lines Co.,
516 U. S. 217,
226228 (1996)
. Congress effort to conform United States law to the standard set forth in the U. N. Convention and Protocol shows that it intended the persecutor bar to apply only to culpable, voluntary actsand it underscores that Congress did not delegate the question presented by this case to the agency.

While I would hold that the persecutor bar does not automatically disqualify from asylum or withholding of removal an alien who acted involuntarily,8 I would leave for the Attorney Generaland, through his own delegation, the BIAthe question how the voluntariness standard should be applied. The agency would retain the ability, for instance, to define duress and coercion; to determine whether or not a balancing test should be employed; and, of course, to decide whether any individual asylum-seekers acts were covered by the persecutor bar. Those are the sorts of questions suited to the agencys unique competencies in administering the INA. The threshold question before the Court is not.

IV

Because I remain convinced that the narrower interpretation of Chevron endorsed by the Court in Cardoza-Fonseca was more faithful to the rationale of that case than the broader view the Court adopts today, I am unable to join its opinion. I would answer the question of law that this case presents with an unequivocal no and remand to the agency for further proceedings.

Notes

1 Notably, the EPA cast its activity not as statutory construction but as public administration; its rulemaking sought to achieve policy goals, such as reducing regulatory complexity and promoting plant modernization. See
46Fed. Reg.
50766 (1981). To be sure, the EPA argued that its regulation defining stationary source as an entire plant was permissible under the Clean Air Act, but the agency treated its rulemaking as a matter of fashioning sound policy, not of discerning the meaning of stationary source in the statute.

2 Cf. United States v. Mead Corp.,
533 U. S. 218,
236238 (2001)
; Barnhart v. Walton,
535 U. S. 212,
222 (2002)
(noting that Mead indicated that whether a court should give [Chevron] deference depends in significant part upon the interpretive method used and the nature of the question at issue).

3 The Administrative Procedure Act draws a similar distinction in providing that courts shall decide all relevant questions of law [and] interpret constitutional and statutory provisions but shall review agency action, findings, and conclusions under the arbitrary and capricious/abuse of discretion standard.
5 U. S. C. §706.

4 Justice Scalia objected in particular to the majoritys holding that pure questions of statutory construction are for the courts, not agencies, to decide; he insisted this was unfaithful to Chevron, since in Chevron the Court deferred to the Environmental Protection Agencys abstract interpretation of the phrase stationary source.  480 U. S., at 455 (opinion concurring in judgment). The majority rejected Justice Scalias argument, recognizing that Chevron involved an agencys complex policy judgment about how to fill a statutory gap, not a pure question of statutory construction. See 480 U. S., at 445448, and n. 29 (quoting extensively from Chevron).

5 The majority suggests that this approach is inconsistent with the  ordinary remand rule  articulated in Gonzales v. Thomas,
547 U. S. 183 (2006)
(per curiam), and INS v. Orlando Ventura,
537 U. S. 12 (2002)
(per curiam). Ante, at 1112. But those cases involved exactly the sort of application of law to fact that is within the agencys purview. In Thomas, the Court of Appeals decided that the family at issue fell within the scope of the statutory term particular social group.  547 U. S., at 185. We noted that the BIA had not considered this question, which require[d] determining the facts and deciding whether the facts as found f[e]ll within a statutory term. Id., at 186. Accordingly, we held that the court should have remanded to the agency. Similarly, in Ventura, the Court of Appeals addressed an issue that the BIA had not reached and concluded that conditions in Guatemala had so improved that no realistic threat of persecution currently existed. The Government argued that the court had not respected the BIAs role as fact-finder, 537 U. S., at 16, and we agreed, reversing the courts judgment insofar as it had not remanded to the agency.

6 Asylum and withholding of removal address concerns different from those addressed by the Convention Against Torture and Other Cruel, Inhuman, or Degrading Treatment or Punishment (CAT) and its implementing regulations. CAT, Dec. 10, 1984, S. Treaty Doc. No. 10020 (1988), 1465 U. N. T. S. 85; 8 CFR §§1208.161208.18 (2008). The CAT prohibits a state party from returning any person to a country where there is substantial reason to believe he might be tortured, but its definition of torture covers a narrower class of harms, imposed by a narrower class of actors, than the asylum and witholding of removal provisions. Most importantly, the CAT limits its definition of torture to acts inflicted by or at the instigation of or with the consent or acquiescence of a public official or other person acting in an official capacity, Pt. I, Art. 1, ¶1, p. 19, while asylum and withholding of removal are available to victims of harm inflicted by private actors, without regard to state involvement, see, e.g., In re Kasinga, 21 I. & N. Dec. 357, 365 (BIA 1996); In re H, 21 I. & N. Dec. 337, 343344 (BIA 1996).

8 Other considerations that are not presented in this case, such as an aliens lack of knowledge that he was involved in a persecutory act, could likewise indicate that he did not act with the requisite culpability. See, e.g., Castańeda-Castillo v. Gonzales, 488 F. 3d 17, 2022 (CA1 2007) (en banc); Hernandez v. Reno, 258 F. 3d 806, 814 (CA8 2001).

on writ of certiorari to the united states court ofappeals for the fifth circuit

[March 3, 2009]

Justice Stevens, with whom Justice Breyer joins, concurring in part and dissenting in part.

The narrow question of statutory construction presented by this case is whether the so-called persecutor bar,
8 U. S. C. §§1101(a)(42), disqualifies from asylum or withholding of removal an alien whose conduct was coerced or otherwise the product of duress. If the answer to that threshold question is no, courts should defer to the Attorney Generals evaluation of particular circumstances that may or may not establish duress or coercion in individual cases. But the threshold question the Court addresses today is a pure question of statutory construction for the courts to decide. INS v. Cardoza-Fonseca,
480 U. S. 421,
446 (1987)
. For that reason, while I agree with the Courts cogent explanation of why its misguided decision in Fedorenko v. United States,
449 U. S. 490 (1981)
, does not govern our interpretation of the persecutor bar, I would provide a definite answer to the question presented and then remand for further proceedings.

I

Judicial deference to agencies views on statutes they administer was not born in Chevron U. S. A. Inc. v. Natural Resources Defense Council, Inc.,
467 U. S. 837 (1984)
, nor did the singularly judicial role of marking the boundaries of agency choice, Young v. Community Nutrition Institute,
476 U. S. 974,
988 (1986)
(Stevens, J., dissenting), die with that case. In the years before Chevron, this Court recognized that statutory interpretation is a multifaceted enterprise, ranging from a precise construction of statutory language to a determination of what policy best effectuates statutory objectives. We accordingly acknowledged that a complete interpretation of a statutory provision might demand both judicial construction and administrative explication. E.g., NLRB v. Hearst Publications, Inc.,
322 U. S. 111 (1944)
(construing the term employee in the National Labor Relations Act but deferring to the National Labor Relations Boards finding that newsboys were employees); see Nathanson, Administrative Discretion in the Interpretation of Statutes, 3 Vand. L. Rev. 470 (1950).

Chevron adhered to this approach. There, we recognized that the Clean Air Act did not define stationary source,
42 U. S. C. §7502(b)(6) (1982 ed.), but rather implicitly delegated to the Environmental Protection Agency (EPA) the policy question whether States could treat entire plants or only their discrete pollution-emitting devices as sources of pollution for purposes of the Acts permit program. Congress left a gap for the agency to fill, and the agency brought its expertise, political acuity, and information-gathering abilities to bear in doing so.See Chevron, 467 U. S., at 865866.1 In keeping with precedent, see id., at 843845, and nn. 9, 1114, our opinion reaffirmed both that [t]he judiciary is the final authority on issues of statutory construction, id., at 843, n. 9, and that courts should defer to an agencys reasonable formulation of policy in response to an explicit or implicit congressional delegation of authority. The Chevron framework thus accounts for the different institutional competencies of agencies and courts: Courts are expert at statutory construction, while agencies are expert at statutory implementation. That the distinction can be subtle does not lessen its importance.

In the 25 years since Chevron was decided, this Court has continued to recognize that courts and agencies play complementary roles in the project of statutory interpretation. We have repeatedly held that ambiguities in statutes within an agencys jurisdiction to administer are delegations of authority to the agency to fill the statutory gap in reasonable fashion. National Cable & Telecommunications Assn. v. Brand X Internet Services,
545 U. S. 967,
980 (2005)
. But even when confronted with a statute that involves a degree of ambiguityas most statutes dowe have not abdicated our judicial role. The fact that Congress has left a gap for the agency to fill means that courts should defer to the agencys reasonable gap-filling decisions, not that courts should cease to mark the bounds of delegated agency choice.2

In cases involving agency adjudication, we have sometimes described the courts role as deciding pure questions of statutory construction and the agencys role as applying law to fact. See, e.g., Cardoza-Fonseca,
480 U. S. 421; NLRB v. Food & Commercial Workers,
484 U. S. 112 (1987)
; see also Republic of Austria v. Altmann,
541 U. S. 677,
701702 (2004)
. While this phrasing is peculiar to the adjudicatory context, the principle applies to Chevrons domain more broadly. In the context of agency rulemaking, for instance, we might distinguish between pure questions of statutory interpretation and policymaking, or between central legal issues and interstitial questions. See Barnhart v. Walton,
535 U. S. 212,
222 (2002)
.3 The label is immaterial. What matters is the principle: Certain aspects of statutory interpretation remain within the purview of the courts, even when the statute is not entirely clear, while others are properly understood as delegated by Congress to an expert and accountable administrative body. Statutory language may thus admit of both judicial construction and agency exposition.

II

Two of this Courts cases construing the Immigration and Nationality Act (INA),
66Stat.
166,
8 U. S. C. §1101et seq., illustrate the proper division of responsibility between courts and agencies and highlight when Chevron deference is appropriate and when it is not. In Cardoza-Fonseca,the question was whether the standard of INA §243(h),
8 U. S. C. §1253(h) (1982 ed.), which requires an alien to show that she is more likely than not to be subject to persecution if she is deported, also governs applications for asylum under §208(a),
8 U. S. C. §1158(a) (1982 ed.), which authorizes the Attorney General to grant asylum to an alien who has a well-founded fear of persecution in her home country. After considering the INAs language, its legislative history, and the United Nations Protocol that Congress had implemented, the Court determined that the two standards are not the same.

In so holding, we decisively rejected the Governments contention, echoed by Justice Scalias concurrence in the judgment, that the Board of Immigration Appeals (BIA) interpretation of the statute merited deference under our then-recent decision in Chevron. The question whether Congress intended the two standards to be identical is a pure question of statutory construction for the courts to decide, we stated. 480 U. S., at 446. We therefore did not defer to the BIAs interpretation of the two standards as equivalent but instead employed traditional tools of statutory construction and concluded that Congress did not intend the two standards to be identical. Ibid.4

Importantly, we recognized that Chevron deference need not be an all-or-nothing venture. Even after the question of the standards equivalency was resolved, there remained the question of their application. We explained, The narrow legal question whether the two standards are the same is, of course, quite different from the question of interpretation that arises in each case in which the agency is required to apply either or both standards to a particular set of facts. 480 U. S., at 448. And we noted that applying the INA was a task particularly suited to the agencys unique competencies:There is obviously some ambiguity in a term like well-founded fear which can only be given concrete meaning through a process of case-by-case adjudication. In that process of filling  any gap left, implicitly or explicitly by Congress,  the courts must respect the interpretation of the agency to which Congress has delegated the responsibility for administering the statutory program. Ibid. (quoting Chevron, 467 U. S., at 843, in turn quoting Morton v. Ruiz,
415 U. S. 199,
231 (1974)
).

In INS v. Aguirre-Aguirre,
526 U. S. 415 (1999)
, the Court encountered just the type of agency decision Cardoza-Fonseca indicated would warrant Chevron deference. The BIA had denied withholding of deportation because it found that the respondent had committed a serious nonpolitical crime before he entered the United States,
8 U. S. C. §1253(h)(2)(C) (1994 ed.). The Court of Appeals reversed the agencys decision and required it to supplement its balancing test with specific additional factors (such as whether the respondents acts were grossly out of proportion to their objective and whether the acts were politically necessary and successful).

We reversed the Court of Appeals, concluding that Chevron deference should be accorded to the BIA as it gives ambiguous statutory terms concrete meaning through a process of case-by-case adjudication.  526 U. S., at 425 (quoting Cardoza-Fonseca,480 U. S., at 448). The BIAs formulation of a test to apply the statutory standard in individual cases and its application of that test in respondents case were precisely the sort of agency actions that merited judicial deference.

III

The threshold question the Court addresses today is the kind of pure question of statutory construction for the courts to decide that we answered in Cardoza-Fonseca, id., at 446, rather than a fact-intensive question of the kind we addressed in Aguirre-Aguirre. Just as we decided the narrow legal question presented in Cardoza-Fonseca but did not attempt to set forth a detailed description of how the well-founded fear test should be applied, 480 U. S., at 448, I would decide the narrow legal question now before us and remand for the agency to determine how the persecutor bar applies in individual cases.5

For reasons similar to those set forth in my dissent in Fedorenko, I think it plain that the persecutor bar does not disqualify from asylum or withholding of removal an alien whose conduct was coerced or otherwise the product of duress. Although I agree in full with the Courts conclusion that the majority opinion in Fedorenko does not govern our interpretation of the persecutor bar, the differences the Court highlights between the Displaced Persons Act of 1948 (DPA),
62Stat.
1009, and the Refugee Act of 1980,
94Stat.
102, only strengthen my conclusion that voluntary assistance in persecution is required and that duress and coercion vitiate voluntariness.

The Fedorenko Courts construction of the DPA threatened to exclude from the United States concentration camp prisoners who were forced to assist the Nazis in the persecution of other prisoners. In my view, this construction was insupportablethe DPAs exclusion of persons who assisted the enemy in persecuting civil populations, Constitution of the International Refugee Organization, Annex I, Part II, §2(a),
62Stat.
3051, did not extend to concentration camp prisoners who did so involuntarily. These prisoners were victims, not persecutors.

Without an exception for involuntary action, the Refugee Acts bar would similarly treat entire classes of victims as persecutors. The Act does not support such a reading. The language of the persecutor bar is most naturally read to denote culpable conduct, and this reading is powerfully supported by the statutory context and legislative history.

As this Court has previously recognizedand as the majority acknowledges again todayCongress passed the Refugee Act to implement the United Nations Convention Relating to the Status of Refugees, 189 U. N. T. S. 150 (July 28, 1951) (hereinafter Convention), reprinted in 19 U. S. T. 6259, and the 1967 United Nations Protocol Relating to the Status of Refugees, Jan. 31, 1967, [1968] 19 U. S. T. 6223, T. I. A. S. No. 6577 (hereinafter Protocol). These treaties place a mandatory obligation on signatory states not to expel or return (refouler) a refugee in any manner whatsoever to … territories where his life or freedom would be threatened on account of his race, religion, nationality, membership of a particular social group or political opinion. Convention, Art. 33(1), 19 U. S. T., at 6276; Protocol, Art. I, 19 U. S. T., at 6225. The Refugee Acts withholding of removal provision specifically tracks this language.
8 U. S. C. §1231(b)(3)(A); see H. R. Rep. No. 96608, p. 18 (1979) (withholding of removal provision clearly reflects our legal obligations under international agreements, specifically Convention Article 33).6

The Convention excludes from the nonrefoulement obligation of Article 33 persons who have committed a crime against peace, a war crime, or a crime against humanity. Convention, Art. 1(F)(a), 19 U. S. T., at 6263. It is this exception that the persecutor bar reflects. See, e.g., H. R. Rep. No. 96608, at 18 (persecutor bar encompasses exceptions … provided in the Convention relating to aliens who have themselves participated in persecution); H. R. Conf. Rep. No. 96781, p. 20 (1980). The language of the Conventions exception is critical: We do not normally convict individuals of crimes when their actions are coerced or otherwise involuntary. Indeed, the United Nations Handbook, to which the Court has looked for guidance in the past, states that all relevant factors, including mitigating circumstances, must be considered in determining whether an aliens acts are of a criminal nature as contemplated by Article 1(F). Office of the United Nations High Commissioner for Refugees, Handbook on Procedures and Criteria for Determining Refugee Status ¶¶157, 162 (reedited Jan. 1992). Other states parties to the Convention and Protocol likewise read the Conventions exception as limited to culpable conduct.7 When we interpret treaties, we consider the interpretations of the courts of other nations, and we should do the same when Congress asks us to interpret a statute in light of a treatys language. See Zicherman v. Korean Air Lines Co.,
516 U. S. 217,
226228 (1996)
. Congress effort to conform United States law to the standard set forth in the U. N. Convention and Protocol shows that it intended the persecutor bar to apply only to culpable, voluntary actsand it underscores that Congress did not delegate the question presented by this case to the agency.

While I would hold that the persecutor bar does not automatically disqualify from asylum or withholding of removal an alien who acted involuntarily,8 I would leave for the Attorney Generaland, through his own delegation, the BIAthe question how the voluntariness standard should be applied. The agency would retain the ability, for instance, to define duress and coercion; to determine whether or not a balancing test should be employed; and, of course, to decide whether any individual asylum-seekers acts were covered by the persecutor bar. Those are the sorts of questions suited to the agencys unique competencies in administering the INA. The threshold question before the Court is not.

IV

Because I remain convinced that the narrower interpretation of Chevron endorsed by the Court in Cardoza-Fonseca was more faithful to the rationale of that case than the broader view the Court adopts today, I am unable to join its opinion. I would answer the question of law that this case presents with an unequivocal no and remand to the agency for further proceedings.

Notes

1 Notably, the EPA cast its activity not as statutory construction but as public administration; its rulemaking sought to achieve policy goals, such as reducing regulatory complexity and promoting plant modernization. See
46Fed. Reg.
50766 (1981). To be sure, the EPA argued that its regulation defining stationary source as an entire plant was permissible under the Clean Air Act, but the agency treated its rulemaking as a matter of fashioning sound policy, not of discerning the meaning of stationary source in the statute.

2 Cf. United States v. Mead Corp.,
533 U. S. 218,
236238 (2001)
; Barnhart v. Walton,
535 U. S. 212,
222 (2002)
(noting that Mead indicated that whether a court should give [Chevron] deference depends in significant part upon the interpretive method used and the nature of the question at issue).

3 The Administrative Procedure Act draws a similar distinction in providing that courts shall decide all relevant questions of law [and] interpret constitutional and statutory provisions but shall review agency action, findings, and conclusions under the arbitrary and capricious/abuse of discretion standard.
5 U. S. C. §706.

4 Justice Scalia objected in particular to the majoritys holding that pure questions of statutory construction are for the courts, not agencies, to decide; he insisted this was unfaithful to Chevron, since in Chevron the Court deferred to the Environmental Protection Agencys abstract interpretation of the phrase stationary source.  480 U. S., at 455 (opinion concurring in judgment). The majority rejected Justice Scalias argument, recognizing that Chevron involved an agencys complex policy judgment about how to fill a statutory gap, not a pure question of statutory construction. See 480 U. S., at 445448, and n. 29 (quoting extensively from Chevron).

5 The majority suggests that this approach is inconsistent with the  ordinary remand rule  articulated in Gonzales v. Thomas,
547 U. S. 183 (2006)
(per curiam), and INS v. Orlando Ventura,
537 U. S. 12 (2002)
(per curiam). Ante, at 1112. But those cases involved exactly the sort of application of law to fact that is within the agencys purview. In Thomas, the Court of Appeals decided that the family at issue fell within the scope of the statutory term particular social group.  547 U. S., at 185. We noted that the BIA had not considered this question, which require[d] determining the facts and deciding whether the facts as found f[e]ll within a statutory term. Id., at 186. Accordingly, we held that the court should have remanded to the agency. Similarly, in Ventura, the Court of Appeals addressed an issue that the BIA had not reached and concluded that conditions in Guatemala had so improved that no realistic threat of persecution currently existed. The Government argued that the court had not respected the BIAs role as fact-finder, 537 U. S., at 16, and we agreed, reversing the courts judgment insofar as it had not remanded to the agency.

6 Asylum and withholding of removal address concerns different from those addressed by the Convention Against Torture and Other Cruel, Inhuman, or Degrading Treatment or Punishment (CAT) and its implementing regulations. CAT, Dec. 10, 1984, S. Treaty Doc. No. 10020 (1988), 1465 U. N. T. S. 85; 8 CFR §§1208.161208.18 (2008). The CAT prohibits a state party from returning any person to a country where there is substantial reason to believe he might be tortured, but its definition of torture covers a narrower class of harms, imposed by a narrower class of actors, than the asylum and witholding of removal provisions. Most importantly, the CAT limits its definition of torture to acts inflicted by or at the instigation of or with the consent or acquiescence of a public official or other person acting in an official capacity, Pt. I, Art. 1, ¶1, p. 19, while asylum and withholding of removal are available to victims of harm inflicted by private actors, without regard to state involvement, see, e.g., In re Kasinga, 21 I. & N. Dec. 357, 365 (BIA 1996); In re H, 21 I. & N. Dec. 337, 343344 (BIA 1996).

8 Other considerations that are not presented in this case, such as an aliens lack of knowledge that he was involved in a persecutory act, could likewise indicate that he did not act with the requisite culpability. See, e.g., Castańeda-Castillo v. Gonzales, 488 F. 3d 17, 2022 (CA1 2007) (en banc); Hernandez v. Reno, 258 F. 3d 806, 814 (CA8 2001).

on writ of certiorari to the united states court ofappeals for the fifth circuit

[March 3, 2009]

Justice Stevens, with whom Justice Breyer joins, concurring in part and dissenting in part.

The narrow question of statutory construction presented by this case is whether the so-called persecutor bar,
8 U. S. C. §§1101(a)(42), disqualifies from asylum or withholding of removal an alien whose conduct was coerced or otherwise the product of duress. If the answer to that threshold question is no, courts should defer to the Attorney Generals evaluation of particular circumstances that may or may not establish duress or coercion in individual cases. But the threshold question the Court addresses today is a pure question of statutory construction for the courts to decide. INS v. Cardoza-Fonseca,
480 U. S. 421,
446 (1987)
. For that reason, while I agree with the Courts cogent explanation of why its misguided decision in Fedorenko v. United States,
449 U. S. 490 (1981)
, does not govern our interpretation of the persecutor bar, I would provide a definite answer to the question presented and then remand for further proceedings.

I

Judicial deference to agencies views on statutes they administer was not born in Chevron U. S. A. Inc. v. Natural Resources Defense Council, Inc.,
467 U. S. 837 (1984)
, nor did the singularly judicial role of marking the boundaries of agency choice, Young v. Community Nutrition Institute,
476 U. S. 974,
988 (1986)
(Stevens, J., dissenting), die with that case. In the years before Chevron, this Court recognized that statutory interpretation is a multifaceted enterprise, ranging from a precise construction of statutory language to a determination of what policy best effectuates statutory objectives. We accordingly acknowledged that a complete interpretation of a statutory provision might demand both judicial construction and administrative explication. E.g., NLRB v. Hearst Publications, Inc.,
322 U. S. 111 (1944)
(construing the term employee in the National Labor Relations Act but deferring to the National Labor Relations Boards finding that newsboys were employees); see Nathanson, Administrative Discretion in the Interpretation of Statutes, 3 Vand. L. Rev. 470 (1950).

Chevron adhered to this approach. There, we recognized that the Clean Air Act did not define stationary source,
42 U. S. C. §7502(b)(6) (1982 ed.), but rather implicitly delegated to the Environmental Protection Agency (EPA) the policy question whether States could treat entire plants or only their discrete pollution-emitting devices as sources of pollution for purposes of the Acts permit program. Congress left a gap for the agency to fill, and the agency brought its expertise, political acuity, and information-gathering abilities to bear in doing so.See Chevron, 467 U. S., at 865866.1 In keeping with precedent, see id., at 843845, and nn. 9, 1114, our opinion reaffirmed both that [t]he judiciary is the final authority on issues of statutory construction, id., at 843, n. 9, and that courts should defer to an agencys reasonable formulation of policy in response to an explicit or implicit congressional delegation of authority. The Chevron framework thus accounts for the different institutional competencies of agencies and courts: Courts are expert at statutory construction, while agencies are expert at statutory implementation. That the distinction can be subtle does not lessen its importance.

In the 25 years since Chevron was decided, this Court has continued to recognize that courts and agencies play complementary roles in the project of statutory interpretation. We have repeatedly held that ambiguities in statutes within an agencys jurisdiction to administer are delegations of authority to the agency to fill the statutory gap in reasonable fashion. National Cable & Telecommunications Assn. v. Brand X Internet Services,
545 U. S. 967,
980 (2005)
. But even when confronted with a statute that involves a degree of ambiguityas most statutes dowe have not abdicated our judicial role. The fact that Congress has left a gap for the agency to fill means that courts should defer to the agencys reasonable gap-filling decisions, not that courts should cease to mark the bounds of delegated agency choice.2

In cases involving agency adjudication, we have sometimes described the courts role as deciding pure questions of statutory construction and the agencys role as applying law to fact. See, e.g., Cardoza-Fonseca,
480 U. S. 421; NLRB v. Food & Commercial Workers,
484 U. S. 112 (1987)
; see also Republic of Austria v. Altmann,
541 U. S. 677,
701702 (2004)
. While this phrasing is peculiar to the adjudicatory context, the principle applies to Chevrons domain more broadly. In the context of agency rulemaking, for instance, we might distinguish between pure questions of statutory interpretation and policymaking, or between central legal issues and interstitial questions. See Barnhart v. Walton,
535 U. S. 212,
222 (2002)
.3 The label is immaterial. What matters is the principle: Certain aspects of statutory interpretation remain within the purview of the courts, even when the statute is not entirely clear, while others are properly understood as delegated by Congress to an expert and accountable administrative body. Statutory language may thus admit of both judicial construction and agency exposition.

II

Two of this Courts cases construing the Immigration and Nationality Act (INA),
66Stat.
166,
8 U. S. C. §1101et seq., illustrate the proper division of responsibility between courts and agencies and highlight when Chevron deference is appropriate and when it is not. In Cardoza-Fonseca,the question was whether the standard of INA §243(h),
8 U. S. C. §1253(h) (1982 ed.), which requires an alien to show that she is more likely than not to be subject to persecution if she is deported, also governs applications for asylum under §208(a),
8 U. S. C. §1158(a) (1982 ed.), which authorizes the Attorney General to grant asylum to an alien who has a well-founded fear of persecution in her home country. After considering the INAs language, its legislative history, and the United Nations Protocol that Congress had implemented, the Court determined that the two standards are not the same.

In so holding, we decisively rejected the Governments contention, echoed by Justice Scalias concurrence in the judgment, that the Board of Immigration Appeals (BIA) interpretation of the statute merited deference under our then-recent decision in Chevron. The question whether Congress intended the two standards to be identical is a pure question of statutory construction for the courts to decide, we stated. 480 U. S., at 446. We therefore did not defer to the BIAs interpretation of the two standards as equivalent but instead employed traditional tools of statutory construction and concluded that Congress did not intend the two standards to be identical. Ibid.4

Importantly, we recognized that Chevron deference need not be an all-or-nothing venture. Even after the question of the standards equivalency was resolved, there remained the question of their application. We explained, The narrow legal question whether the two standards are the same is, of course, quite different from the question of interpretation that arises in each case in which the agency is required to apply either or both standards to a particular set of facts. 480 U. S., at 448. And we noted that applying the INA was a task particularly suited to the agencys unique competencies:There is obviously some ambiguity in a term like well-founded fear which can only be given concrete meaning through a process of case-by-case adjudication. In that process of filling  any gap left, implicitly or explicitly by Congress,  the courts must respect the interpretation of the agency to which Congress has delegated the responsibility for administering the statutory program. Ibid. (quoting Chevron, 467 U. S., at 843, in turn quoting Morton v. Ruiz,
415 U. S. 199,
231 (1974)
).

In INS v. Aguirre-Aguirre,
526 U. S. 415 (1999)
, the Court encountered just the type of agency decision Cardoza-Fonseca indicated would warrant Chevron deference. The BIA had denied withholding of deportation because it found that the respondent had committed a serious nonpolitical crime before he entered the United States,
8 U. S. C. §1253(h)(2)(C) (1994 ed.). The Court of Appeals reversed the agencys decision and required it to supplement its balancing test with specific additional factors (such as whether the respondents acts were grossly out of proportion to their objective and whether the acts were politically necessary and successful).

We reversed the Court of Appeals, concluding that Chevron deference should be accorded to the BIA as it gives ambiguous statutory terms concrete meaning through a process of case-by-case adjudication.  526 U. S., at 425 (quoting Cardoza-Fonseca,480 U. S., at 448). The BIAs formulation of a test to apply the statutory standard in individual cases and its application of that test in respondents case were precisely the sort of agency actions that merited judicial deference.

III

The threshold question the Court addresses today is the kind of pure question of statutory construction for the courts to decide that we answered in Cardoza-Fonseca, id., at 446, rather than a fact-intensive question of the kind we addressed in Aguirre-Aguirre. Just as we decided the narrow legal question presented in Cardoza-Fonseca but did not attempt to set forth a detailed description of how the well-founded fear test should be applied, 480 U. S., at 448, I would decide the narrow legal question now before us and remand for the agency to determine how the persecutor bar applies in individual cases.5

For reasons similar to those set forth in my dissent in Fedorenko, I think it plain that the persecutor bar does not disqualify from asylum or withholding of removal an alien whose conduct was coerced or otherwise the product of duress. Although I agree in full with the Courts conclusion that the majority opinion in Fedorenko does not govern our interpretation of the persecutor bar, the differences the Court highlights between the Displaced Persons Act of 1948 (DPA),
62Stat.
1009, and the Refugee Act of 1980,
94Stat.
102, only strengthen my conclusion that voluntary assistance in persecution is required and that duress and coercion vitiate voluntariness.

The Fedorenko Courts construction of the DPA threatened to exclude from the United States concentration camp prisoners who were forced to assist the Nazis in the persecution of other prisoners. In my view, this construction was insupportablethe DPAs exclusion of persons who assisted the enemy in persecuting civil populations, Constitution of the International Refugee Organization, Annex I, Part II, §2(a),
62Stat.
3051, did not extend to concentration camp prisoners who did so involuntarily. These prisoners were victims, not persecutors.

Without an exception for involuntary action, the Refugee Acts bar would similarly treat entire classes of victims as persecutors. The Act does not support such a reading. The language of the persecutor bar is most naturally read to denote culpable conduct, and this reading is powerfully supported by the statutory context and legislative history.

As this Court has previously recognizedand as the majority acknowledges again todayCongress passed the Refugee Act to implement the United Nations Convention Relating to the Status of Refugees, 189 U. N. T. S. 150 (July 28, 1951) (hereinafter Convention), reprinted in 19 U. S. T. 6259, and the 1967 United Nations Protocol Relating to the Status of Refugees, Jan. 31, 1967, [1968] 19 U. S. T. 6223, T. I. A. S. No. 6577 (hereinafter Protocol). These treaties place a mandatory obligation on signatory states not to expel or return (refouler) a refugee in any manner whatsoever to … territories where his life or freedom would be threatened on account of his race, religion, nationality, membership of a particular social group or political opinion. Convention, Art. 33(1), 19 U. S. T., at 6276; Protocol, Art. I, 19 U. S. T., at 6225. The Refugee Acts withholding of removal provision specifically tracks this language.
8 U. S. C. §1231(b)(3)(A); see H. R. Rep. No. 96608, p. 18 (1979) (withholding of removal provision clearly reflects our legal obligations under international agreements, specifically Convention Article 33).6

The Convention excludes from the nonrefoulement obligation of Article 33 persons who have committed a crime against peace, a war crime, or a crime against humanity. Convention, Art. 1(F)(a), 19 U. S. T., at 6263. It is this exception that the persecutor bar reflects. See, e.g., H. R. Rep. No. 96608, at 18 (persecutor bar encompasses exceptions … provided in the Convention relating to aliens who have themselves participated in persecution); H. R. Conf. Rep. No. 96781, p. 20 (1980). The language of the Conventions exception is critical: We do not normally convict individuals of crimes when their actions are coerced or otherwise involuntary. Indeed, the United Nations Handbook, to which the Court has looked for guidance in the past, states that all relevant factors, including mitigating circumstances, must be considered in determining whether an aliens acts are of a criminal nature as contemplated by Article 1(F). Office of the United Nations High Commissioner for Refugees, Handbook on Procedures and Criteria for Determining Refugee Status ¶¶157, 162 (reedited Jan. 1992). Other states parties to the Convention and Protocol likewise read the Conventions exception as limited to culpable conduct.7 When we interpret treaties, we consider the interpretations of the courts of other nations, and we should do the same when Congress asks us to interpret a statute in light of a treatys language. See Zicherman v. Korean Air Lines Co.,
516 U. S. 217,
226228 (1996)
. Congress effort to conform United States law to the standard set forth in the U. N. Convention and Protocol shows that it intended the persecutor bar to apply only to culpable, voluntary actsand it underscores that Congress did not delegate the question presented by this case to the agency.

While I would hold that the persecutor bar does not automatically disqualify from asylum or withholding of removal an alien who acted involuntarily,8 I would leave for the Attorney Generaland, through his own delegation, the BIAthe question how the voluntariness standard should be applied. The agency would retain the ability, for instance, to define duress and coercion; to determine whether or not a balancing test should be employed; and, of course, to decide whether any individual asylum-seekers acts were covered by the persecutor bar. Those are the sorts of questions suited to the agencys unique competencies in administering the INA. The threshold question before the Court is not.

IV

Because I remain convinced that the narrower interpretation of Chevron endorsed by the Court in Cardoza-Fonseca was more faithful to the rationale of that case than the broader view the Court adopts today, I am unable to join its opinion. I would answer the question of law that this case presents with an unequivocal no and remand to the agency for further proceedings.

Notes

1 Notably, the EPA cast its activity not as statutory construction but as public administration; its rulemaking sought to achieve policy goals, such as reducing regulatory complexity and promoting plant modernization. See
46Fed. Reg.
50766 (1981). To be sure, the EPA argued that its regulation defining stationary source as an entire plant was permissible under the Clean Air Act, but the agency treated its rulemaking as a matter of fashioning sound policy, not of discerning the meaning of stationary source in the statute.

2 Cf. United States v. Mead Corp.,
533 U. S. 218,
236238 (2001)
; Barnhart v. Walton,
535 U. S. 212,
222 (2002)
(noting that Mead indicated that whether a court should give [Chevron] deference depends in significant part upon the interpretive method used and the nature of the question at issue).

3 The Administrative Procedure Act draws a similar distinction in providing that courts shall decide all relevant questions of law [and] interpret constitutional and statutory provisions but shall review agency action, findings, and conclusions under the arbitrary and capricious/abuse of discretion standard.
5 U. S. C. §706.

4 Justice Scalia objected in particular to the majoritys holding that pure questions of statutory construction are for the courts, not agencies, to decide; he insisted this was unfaithful to Chevron, since in Chevron the Court deferred to the Environmental Protection Agencys abstract interpretation of the phrase stationary source.  480 U. S., at 455 (opinion concurring in judgment). The majority rejected Justice Scalias argument, recognizing that Chevron involved an agencys complex policy judgment about how to fill a statutory gap, not a pure question of statutory construction. See 480 U. S., at 445448, and n. 29 (quoting extensively from Chevron).

5 The majority suggests that this approach is inconsistent with the  ordinary remand rule  articulated in Gonzales v. Thomas,
547 U. S. 183 (2006)
(per curiam), and INS v. Orlando Ventura,
537 U. S. 12 (2002)
(per curiam). Ante, at 1112. But those cases involved exactly the sort of application of law to fact that is within the agencys purview. In Thomas, the Court of Appeals decided that the family at issue fell within the scope of the statutory term particular social group.  547 U. S., at 185. We noted that the BIA had not considered this question, which require[d] determining the facts and deciding whether the facts as found f[e]ll within a statutory term. Id., at 186. Accordingly, we held that the court should have remanded to the agency. Similarly, in Ventura, the Court of Appeals addressed an issue that the BIA had not reached and concluded that conditions in Guatemala had so improved that no realistic threat of persecution currently existed. The Government argued that the court had not respected the BIAs role as fact-finder, 537 U. S., at 16, and we agreed, reversing the courts judgment insofar as it had not remanded to the agency.

6 Asylum and withholding of removal address concerns different from those addressed by the Convention Against Torture and Other Cruel, Inhuman, or Degrading Treatment or Punishment (CAT) and its implementing regulations. CAT, Dec. 10, 1984, S. Treaty Doc. No. 10020 (1988), 1465 U. N. T. S. 85; 8 CFR §§1208.161208.18 (2008). The CAT prohibits a state party from returning any person to a country where there is substantial reason to believe he might be tortured, but its definition of torture covers a narrower class of harms, imposed by a narrower class of actors, than the asylum and witholding of removal provisions. Most importantly, the CAT limits its definition of torture to acts inflicted by or at the instigation of or with the consent or acquiescence of a public official or other person acting in an official capacity, Pt. I, Art. 1, ¶1, p. 19, while asylum and withholding of removal are available to victims of harm inflicted by private actors, without regard to state involvement, see, e.g., In re Kasinga, 21 I. & N. Dec. 357, 365 (BIA 1996); In re H, 21 I. & N. Dec. 337, 343344 (BIA 1996).

8 Other considerations that are not presented in this case, such as an aliens lack of knowledge that he was involved in a persecutory act, could likewise indicate that he did not act with the requisite culpability. See, e.g., Castańeda-Castillo v. Gonzales, 488 F. 3d 17, 2022 (CA1 2007) (en banc); Hernandez v. Reno, 258 F. 3d 806, 814 (CA8 2001).

on writ of certiorari to the united states court ofappeals for the fifth circuit

[March 3, 2009]

Justice Stevens, with whom Justice Breyer joins, concurring in part and dissenting in part.

The narrow question of statutory construction presented by this case is whether the so-called persecutor bar,
8 U. S. C. §§1101(a)(42), disqualifies from asylum or withholding of removal an alien whose conduct was coerced or otherwise the product of duress. If the answer to that threshold question is no, courts should defer to the Attorney Generals evaluation of particular circumstances that may or may not establish duress or coercion in individual cases. But the threshold question the Court addresses today is a pure question of statutory construction for the courts to decide. INS v. Cardoza-Fonseca,
480 U. S. 421,
446 (1987)
. For that reason, while I agree with the Courts cogent explanation of why its misguided decision in Fedorenko v. United States,
449 U. S. 490 (1981)
, does not govern our interpretation of the persecutor bar, I would provide a definite answer to the question presented and then remand for further proceedings.

I

Judicial deference to agencies views on statutes they administer was not born in Chevron U. S. A. Inc. v. Natural Resources Defense Council, Inc.,
467 U. S. 837 (1984)
, nor did the singularly judicial role of marking the boundaries of agency choice, Young v. Community Nutrition Institute,
476 U. S. 974,
988 (1986)
(Stevens, J., dissenting), die with that case. In the years before Chevron, this Court recognized that statutory interpretation is a multifaceted enterprise, ranging from a precise construction of statutory language to a determination of what policy best effectuates statutory objectives. We accordingly acknowledged that a complete interpretation of a statutory provision might demand both judicial construction and administrative explication. E.g., NLRB v. Hearst Publications, Inc.,
322 U. S. 111 (1944)
(construing the term employee in the National Labor Relations Act but deferring to the National Labor Relations Boards finding that newsboys were employees); see Nathanson, Administrative Discretion in the Interpretation of Statutes, 3 Vand. L. Rev. 470 (1950).

Chevron adhered to this approach. There, we recognized that the Clean Air Act did not define stationary source,
42 U. S. C. §7502(b)(6) (1982 ed.), but rather implicitly delegated to the Environmental Protection Agency (EPA) the policy question whether States could treat entire plants or only their discrete pollution-emitting devices as sources of pollution for purposes of the Acts permit program. Congress left a gap for the agency to fill, and the agency brought its expertise, political acuity, and information-gathering abilities to bear in doing so.See Chevron, 467 U. S., at 865866.1 In keeping with precedent, see id., at 843845, and nn. 9, 1114, our opinion reaffirmed both that [t]he judiciary is the final authority on issues of statutory construction, id., at 843, n. 9, and that courts should defer to an agencys reasonable formulation of policy in response to an explicit or implicit congressional delegation of authority. The Chevron framework thus accounts for the different institutional competencies of agencies and courts: Courts are expert at statutory construction, while agencies are expert at statutory implementation. That the distinction can be subtle does not lessen its importance.

In the 25 years since Chevron was decided, this Court has continued to recognize that courts and agencies play complementary roles in the project of statutory interpretation. We have repeatedly held that ambiguities in statutes within an agencys jurisdiction to administer are delegations of authority to the agency to fill the statutory gap in reasonable fashion. National Cable & Telecommunications Assn. v. Brand X Internet Services,
545 U. S. 967,
980 (2005)
. But even when confronted with a statute that involves a degree of ambiguityas most statutes dowe have not abdicated our judicial role. The fact that Congress has left a gap for the agency to fill means that courts should defer to the agencys reasonable gap-filling decisions, not that courts should cease to mark the bounds of delegated agency choice.2

In cases involving agency adjudication, we have sometimes described the courts role as deciding pure questions of statutory construction and the agencys role as applying law to fact. See, e.g., Cardoza-Fonseca,
480 U. S. 421; NLRB v. Food & Commercial Workers,
484 U. S. 112 (1987)
; see also Republic of Austria v. Altmann,
541 U. S. 677,
701702 (2004)
. While this phrasing is peculiar to the adjudicatory context, the principle applies to Chevrons domain more broadly. In the context of agency rulemaking, for instance, we might distinguish between pure questions of statutory interpretation and policymaking, or between central legal issues and interstitial questions. See Barnhart v. Walton,
535 U. S. 212,
222 (2002)
.3 The label is immaterial. What matters is the principle: Certain aspects of statutory interpretation remain within the purview of the courts, even when the statute is not entirely clear, while others are properly understood as delegated by Congress to an expert and accountable administrative body. Statutory language may thus admit of both judicial construction and agency exposition.

II

Two of this Courts cases construing the Immigration and Nationality Act (INA),
66Stat.
166,
8 U. S. C. §1101et seq., illustrate the proper division of responsibility between courts and agencies and highlight when Chevron deference is appropriate and when it is not. In Cardoza-Fonseca,the question was whether the standard of INA §243(h),
8 U. S. C. §1253(h) (1982 ed.), which requires an alien to show that she is more likely than not to be subject to persecution if she is deported, also governs applications for asylum under §208(a),
8 U. S. C. §1158(a) (1982 ed.), which authorizes the Attorney General to grant asylum to an alien who has a well-founded fear of persecution in her home country. After considering the INAs language, its legislative history, and the United Nations Protocol that Congress had implemented, the Court determined that the two standards are not the same.

In so holding, we decisively rejected the Governments contention, echoed by Justice Scalias concurrence in the judgment, that the Board of Immigration Appeals (BIA) interpretation of the statute merited deference under our then-recent decision in Chevron. The question whether Congress intended the two standards to be identical is a pure question of statutory construction for the courts to decide, we stated. 480 U. S., at 446. We therefore did not defer to the BIAs interpretation of the two standards as equivalent but instead employed traditional tools of statutory construction and concluded that Congress did not intend the two standards to be identical. Ibid.4

Importantly, we recognized that Chevron deference need not be an all-or-nothing venture. Even after the question of the standards equivalency was resolved, there remained the question of their application. We explained, The narrow legal question whether the two standards are the same is, of course, quite different from the question of interpretation that arises in each case in which the agency is required to apply either or both standards to a particular set of facts. 480 U. S., at 448. And we noted that applying the INA was a task particularly suited to the agencys unique competencies:There is obviously some ambiguity in a term like well-founded fear which can only be given concrete meaning through a process of case-by-case adjudication. In that process of filling  any gap left, implicitly or explicitly by Congress,  the courts must respect the interpretation of the agency to which Congress has delegated the responsibility for administering the statutory program. Ibid. (quoting Chevron, 467 U. S., at 843, in turn quoting Morton v. Ruiz,
415 U. S. 199,
231 (1974)
).

In INS v. Aguirre-Aguirre,
526 U. S. 415 (1999)
, the Court encountered just the type of agency decision Cardoza-Fonseca indicated would warrant Chevron deference. The BIA had denied withholding of deportation because it found that the respondent had committed a serious nonpolitical crime before he entered the United States,
8 U. S. C. §1253(h)(2)(C) (1994 ed.). The Court of Appeals reversed the agencys decision and required it to supplement its balancing test with specific additional factors (such as whether the respondents acts were grossly out of proportion to their objective and whether the acts were politically necessary and successful).

We reversed the Court of Appeals, concluding that Chevron deference should be accorded to the BIA as it gives ambiguous statutory terms concrete meaning through a process of case-by-case adjudication.  526 U. S., at 425 (quoting Cardoza-Fonseca,480 U. S., at 448). The BIAs formulation of a test to apply the statutory standard in individual cases and its application of that test in respondents case were precisely the sort of agency actions that merited judicial deference.

III

The threshold question the Court addresses today is the kind of pure question of statutory construction for the courts to decide that we answered in Cardoza-Fonseca, id., at 446, rather than a fact-intensive question of the kind we addressed in Aguirre-Aguirre. Just as we decided the narrow legal question presented in Cardoza-Fonseca but did not attempt to set forth a detailed description of how the well-founded fear test should be applied, 480 U. S., at 448, I would decide the narrow legal question now before us and remand for the agency to determine how the persecutor bar applies in individual cases.5

For reasons similar to those set forth in my dissent in Fedorenko, I think it plain that the persecutor bar does not disqualify from asylum or withholding of removal an alien whose conduct was coerced or otherwise the product of duress. Although I agree in full with the Courts conclusion that the majority opinion in Fedorenko does not govern our interpretation of the persecutor bar, the differences the Court highlights between the Displaced Persons Act of 1948 (DPA),
62Stat.
1009, and the Refugee Act of 1980,
94Stat.
102, only strengthen my conclusion that voluntary assistance in persecution is required and that duress and coercion vitiate voluntariness.

The Fedorenko Courts construction of the DPA threatened to exclude from the United States concentration camp prisoners who were forced to assist the Nazis in the persecution of other prisoners. In my view, this construction was insupportablethe DPAs exclusion of persons who assisted the enemy in persecuting civil populations, Constitution of the International Refugee Organization, Annex I, Part II, §2(a),
62Stat.
3051, did not extend to concentration camp prisoners who did so involuntarily. These prisoners were victims, not persecutors.

Without an exception for involuntary action, the Refugee Acts bar would similarly treat entire classes of victims as persecutors. The Act does not support such a reading. The language of the persecutor bar is most naturally read to denote culpable conduct, and this reading is powerfully supported by the statutory context and legislative history.

As this Court has previously recognizedand as the majority acknowledges again todayCongress passed the Refugee Act to implement the United Nations Convention Relating to the Status of Refugees, 189 U. N. T. S. 150 (July 28, 1951) (hereinafter Convention), reprinted in 19 U. S. T. 6259, and the 1967 United Nations Protocol Relating to the Status of Refugees, Jan. 31, 1967, [1968] 19 U. S. T. 6223, T. I. A. S. No. 6577 (hereinafter Protocol). These treaties place a mandatory obligation on signatory states not to expel or return (refouler) a refugee in any manner whatsoever to … territories where his life or freedom would be threatened on account of his race, religion, nationality, membership of a particular social group or political opinion. Convention, Art. 33(1), 19 U. S. T., at 6276; Protocol, Art. I, 19 U. S. T., at 6225. The Refugee Acts withholding of removal provision specifically tracks this language.
8 U. S. C. §1231(b)(3)(A); see H. R. Rep. No. 96608, p. 18 (1979) (withholding of removal provision clearly reflects our legal obligations under international agreements, specifically Convention Article 33).6

The Convention excludes from the nonrefoulement obligation of Article 33 persons who have committed a crime against peace, a war crime, or a crime against humanity. Convention, Art. 1(F)(a), 19 U. S. T., at 6263. It is this exception that the persecutor bar reflects. See, e.g., H. R. Rep. No. 96608, at 18 (persecutor bar encompasses exceptions … provided in the Convention relating to aliens who have themselves participated in persecution); H. R. Conf. Rep. No. 96781, p. 20 (1980). The language of the Conventions exception is critical: We do not normally convict individuals of crimes when their actions are coerced or otherwise involuntary. Indeed, the United Nations Handbook, to which the Court has looked for guidance in the past, states that all relevant factors, including mitigating circumstances, must be considered in determining whether an aliens acts are of a criminal nature as contemplated by Article 1(F). Office of the United Nations High Commissioner for Refugees, Handbook on Procedures and Criteria for Determining Refugee Status ¶¶157, 162 (reedited Jan. 1992). Other states parties to the Convention and Protocol likewise read the Conventions exception as limited to culpable conduct.7 When we interpret treaties, we consider the interpretations of the courts of other nations, and we should do the same when Congress asks us to interpret a statute in light of a treatys language. See Zicherman v. Korean Air Lines Co.,
516 U. S. 217,
226228 (1996)
. Congress effort to conform United States law to the standard set forth in the U. N. Convention and Protocol shows that it intended the persecutor bar to apply only to culpable, voluntary actsand it underscores that Congress did not delegate the question presented by this case to the agency.

While I would hold that the persecutor bar does not automatically disqualify from asylum or withholding of removal an alien who acted involuntarily,8 I would leave for the Attorney Generaland, through his own delegation, the BIAthe question how the voluntariness standard should be applied. The agency would retain the ability, for instance, to define duress and coercion; to determine whether or not a balancing test should be employed; and, of course, to decide whether any individual asylum-seekers acts were covered by the persecutor bar. Those are the sorts of questions suited to the agencys unique competencies in administering the INA. The threshold question before the Court is not.

IV

Because I remain convinced that the narrower interpretation of Chevron endorsed by the Court in Cardoza-Fonseca was more faithful to the rationale of that case than the broader view the Court adopts today, I am unable to join its opinion. I would answer the question of law that this case presents with an unequivocal no and remand to the agency for further proceedings.

Notes

1 Notably, the EPA cast its activity not as statutory construction but as public administration; its rulemaking sought to achieve policy goals, such as reducing regulatory complexity and promoting plant modernization. See
46Fed. Reg.
50766 (1981). To be sure, the EPA argued that its regulation defining stationary source as an entire plant was permissible under the Clean Air Act, but the agency treated its rulemaking as a matter of fashioning sound policy, not of discerning the meaning of stationary source in the statute.

2 Cf. United States v. Mead Corp.,
533 U. S. 218,
236238 (2001)
; Barnhart v. Walton,
535 U. S. 212,
222 (2002)
(noting that Mead indicated that whether a court should give [Chevron] deference depends in significant part upon the interpretive method used and the nature of the question at issue).

3 The Administrative Procedure Act draws a similar distinction in providing that courts shall decide all relevant questions of law [and] interpret constitutional and statutory provisions but shall review agency action, findings, and conclusions under the arbitrary and capricious/abuse of discretion standard.
5 U. S. C. §706.

4 Justice Scalia objected in particular to the majoritys holding that pure questions of statutory construction are for the courts, not agencies, to decide; he insisted this was unfaithful to Chevron, since in Chevron the Court deferred to the Environmental Protection Agencys abstract interpretation of the phrase stationary source.  480 U. S., at 455 (opinion concurring in judgment). The majority rejected Justice Scalias argument, recognizing that Chevron involved an agencys complex policy judgment about how to fill a statutory gap, not a pure question of statutory construction. See 480 U. S., at 445448, and n. 29 (quoting extensively from Chevron).

5 The majority suggests that this approach is inconsistent with the  ordinary remand rule  articulated in Gonzales v. Thomas,
547 U. S. 183 (2006)
(per curiam), and INS v. Orlando Ventura,
537 U. S. 12 (2002)
(per curiam). Ante, at 1112. But those cases involved exactly the sort of application of law to fact that is within the agencys purview. In Thomas, the Court of Appeals decided that the family at issue fell within the scope of the statutory term particular social group.  547 U. S., at 185. We noted that the BIA had not considered this question, which require[d] determining the facts and deciding whether the facts as found f[e]ll within a statutory term. Id., at 186. Accordingly, we held that the court should have remanded to the agency. Similarly, in Ventura, the Court of Appeals addressed an issue that the BIA had not reached and concluded that conditions in Guatemala had so improved that no realistic threat of persecution currently existed. The Government argued that the court had not respected the BIAs role as fact-finder, 537 U. S., at 16, and we agreed, reversing the courts judgment insofar as it had not remanded to the agency.

6 Asylum and withholding of removal address concerns different from those addressed by the Convention Against Torture and Other Cruel, Inhuman, or Degrading Treatment or Punishment (CAT) and its implementing regulations. CAT, Dec. 10, 1984, S. Treaty Doc. No. 10020 (1988), 1465 U. N. T. S. 85; 8 CFR §§1208.161208.18 (2008). The CAT prohibits a state party from returning any person to a country where there is substantial reason to believe he might be tortured, but its definition of torture covers a narrower class of harms, imposed by a narrower class of actors, than the asylum and witholding of removal provisions. Most importantly, the CAT limits its definition of torture to acts inflicted by or at the instigation of or with the consent or acquiescence of a public official or other person acting in an official capacity, Pt. I, Art. 1, ¶1, p. 19, while asylum and withholding of removal are available to victims of harm inflicted by private actors, without regard to state involvement, see, e.g., In re Kasinga, 21 I. & N. Dec. 357, 365 (BIA 1996); In re H, 21 I. & N. Dec. 337, 343344 (BIA 1996).

8 Other considerations that are not presented in this case, such as an aliens lack of knowledge that he was involved in a persecutory act, could likewise indicate that he did not act with the requisite culpability. See, e.g., Castańeda-Castillo v. Gonzales, 488 F. 3d 17, 2022 (CA1 2007) (en banc); Hernandez v. Reno, 258 F. 3d 806, 814 (CA8 2001).

on writ of certiorari to the united states court ofappeals for the fifth circuit

[March 3, 2009]

Justice Stevens, with whom Justice Breyer joins, concurring in part and dissenting in part.

The narrow question of statutory construction presented by this case is whether the so-called persecutor bar,
8 U. S. C. §§1101(a)(42), disqualifies from asylum or withholding of removal an alien whose conduct was coerced or otherwise the product of duress. If the answer to that threshold question is no, courts should defer to the Attorney Generals evaluation of particular circumstances that may or may not establish duress or coercion in individual cases. But the threshold question the Court addresses today is a pure question of statutory construction for the courts to decide. INS v. Cardoza-Fonseca,
480 U. S. 421,
446 (1987)
. For that reason, while I agree with the Courts cogent explanation of why its misguided decision in Fedorenko v. United States,
449 U. S. 490 (1981)
, does not govern our interpretation of the persecutor bar, I would provide a definite answer to the question presented and then remand for further proceedings.

I

Judicial deference to agencies views on statutes they administer was not born in Chevron U. S. A. Inc. v. Natural Resources Defense Council, Inc.,
467 U. S. 837 (1984)
, nor did the singularly judicial role of marking the boundaries of agency choice, Young v. Community Nutrition Institute,
476 U. S. 974,
988 (1986)
(Stevens, J., dissenting), die with that case. In the years before Chevron, this Court recognized that statutory interpretation is a multifaceted enterprise, ranging from a precise construction of statutory language to a determination of what policy best effectuates statutory objectives. We accordingly acknowledged that a complete interpretation of a statutory provision might demand both judicial construction and administrative explication. E.g., NLRB v. Hearst Publications, Inc.,
322 U. S. 111 (1944)
(construing the term employee in the National Labor Relations Act but deferring to the National Labor Relations Boards finding that newsboys were employees); see Nathanson, Administrative Discretion in the Interpretation of Statutes, 3 Vand. L. Rev. 470 (1950).

Chevron adhered to this approach. There, we recognized that the Clean Air Act did not define stationary source,
42 U. S. C. §7502(b)(6) (1982 ed.), but rather implicitly delegated to the Environmental Protection Agency (EPA) the policy question whether States could treat entire plants or only their discrete pollution-emitting devices as sources of pollution for purposes of the Acts permit program. Congress left a gap for the agency to fill, and the agency brought its expertise, political acuity, and information-gathering abilities to bear in doing so.See Chevron, 467 U. S., at 865866.1 In keeping with precedent, see id., at 843845, and nn. 9, 1114, our opinion reaffirmed both that [t]he judiciary is the final authority on issues of statutory construction, id., at 843, n. 9, and that courts should defer to an agencys reasonable formulation of policy in response to an explicit or implicit congressional delegation of authority. The Chevron framework thus accounts for the different institutional competencies of agencies and courts: Courts are expert at statutory construction, while agencies are expert at statutory implementation. That the distinction can be subtle does not lessen its importance.

In the 25 years since Chevron was decided, this Court has continued to recognize that courts and agencies play complementary roles in the project of statutory interpretation. We have repeatedly held that ambiguities in statutes within an agencys jurisdiction to administer are delegations of authority to the agency to fill the statutory gap in reasonable fashion. National Cable & Telecommunications Assn. v. Brand X Internet Services,
545 U. S. 967,
980 (2005)
. But even when confronted with a statute that involves a degree of ambiguityas most statutes dowe have not abdicated our judicial role. The fact that Congress has left a gap for the agency to fill means that courts should defer to the agencys reasonable gap-filling decisions, not that courts should cease to mark the bounds of delegated agency choice.2

In cases involving agency adjudication, we have sometimes described the courts role as deciding pure questions of statutory construction and the agencys role as applying law to fact. See, e.g., Cardoza-Fonseca,
480 U. S. 421; NLRB v. Food & Commercial Workers,
484 U. S. 112 (1987)
; see also Republic of Austria v. Altmann,
541 U. S. 677,
701702 (2004)
. While this phrasing is peculiar to the adjudicatory context, the principle applies to Chevrons domain more broadly. In the context of agency rulemaking, for instance, we might distinguish between pure questions of statutory interpretation and policymaking, or between central legal issues and interstitial questions. See Barnhart v. Walton,
535 U. S. 212,
222 (2002)
.3 The label is immaterial. What matters is the principle: Certain aspects of statutory interpretation remain within the purview of the courts, even when the statute is not entirely clear, while others are properly understood as delegated by Congress to an expert and accountable administrative body. Statutory language may thus admit of both judicial construction and agency exposition.

II

Two of this Courts cases construing the Immigration and Nationality Act (INA),
66Stat.
166,
8 U. S. C. §1101et seq., illustrate the proper division of responsibility between courts and agencies and highlight when Chevron deference is appropriate and when it is not. In Cardoza-Fonseca,the question was whether the standard of INA §243(h),
8 U. S. C. §1253(h) (1982 ed.), which requires an alien to show that she is more likely than not to be subject to persecution if she is deported, also governs applications for asylum under §208(a),
8 U. S. C. §1158(a) (1982 ed.), which authorizes the Attorney General to grant asylum to an alien who has a well-founded fear of persecution in her home country. After considering the INAs language, its legislative history, and the United Nations Protocol that Congress had implemented, the Court determined that the two standards are not the same.

In so holding, we decisively rejected the Governments contention, echoed by Justice Scalias concurrence in the judgment, that the Board of Immigration Appeals (BIA) interpretation of the statute merited deference under our then-recent decision in Chevron. The question whether Congress intended the two standards to be identical is a pure question of statutory construction for the courts to decide, we stated. 480 U. S., at 446. We therefore did not defer to the BIAs interpretation of the two standards as equivalent but instead employed traditional tools of statutory construction and concluded that Congress did not intend the two standards to be identical. Ibid.4

Importantly, we recognized that Chevron deference need not be an all-or-nothing venture. Even after the question of the standards equivalency was resolved, there remained the question of their application. We explained, The narrow legal question whether the two standards are the same is, of course, quite different from the question of interpretation that arises in each case in which the agency is required to apply either or both standards to a particular set of facts. 480 U. S., at 448. And we noted that applying the INA was a task particularly suited to the agencys unique competencies:There is obviously some ambiguity in a term like well-founded fear which can only be given concrete meaning through a process of case-by-case adjudication. In that process of filling  any gap left, implicitly or explicitly by Congress,  the courts must respect the interpretation of the agency to which Congress has delegated the responsibility for administering the statutory program. Ibid. (quoting Chevron, 467 U. S., at 843, in turn quoting Morton v. Ruiz,
415 U. S. 199,
231 (1974)
).

In INS v. Aguirre-Aguirre,
526 U. S. 415 (1999)
, the Court encountered just the type of agency decision Cardoza-Fonseca indicated would warrant Chevron deference. The BIA had denied withholding of deportation because it found that the respondent had committed a serious nonpolitical crime before he entered the United States,
8 U. S. C. §1253(h)(2)(C) (1994 ed.). The Court of Appeals reversed the agencys decision and required it to supplement its balancing test with specific additional factors (such as whether the respondents acts were grossly out of proportion to their objective and whether the acts were politically necessary and successful).

We reversed the Court of Appeals, concluding that Chevron deference should be accorded to the BIA as it gives ambiguous statutory terms concrete meaning through a process of case-by-case adjudication.  526 U. S., at 425 (quoting Cardoza-Fonseca,480 U. S., at 448). The BIAs formulation of a test to apply the statutory standard in individual cases and its application of that test in respondents case were precisely the sort of agency actions that merited judicial deference.

III

The threshold question the Court addresses today is the kind of pure question of statutory construction for the courts to decide that we answered in Cardoza-Fonseca, id., at 446, rather than a fact-intensive question of the kind we addressed in Aguirre-Aguirre. Just as we decided the narrow legal question presented in Cardoza-Fonseca but did not attempt to set forth a detailed description of how the well-founded fear test should be applied, 480 U. S., at 448, I would decide the narrow legal question now before us and remand for the agency to determine how the persecutor bar applies in individual cases.5

For reasons similar to those set forth in my dissent in Fedorenko, I think it plain that the persecutor bar does not disqualify from asylum or withholding of removal an alien whose conduct was coerced or otherwise the product of duress. Although I agree in full with the Courts conclusion that the majority opinion in Fedorenko does not govern our interpretation of the persecutor bar, the differences the Court highlights between the Displaced Persons Act of 1948 (DPA),
62Stat.
1009, and the Refugee Act of 1980,
94Stat.
102, only strengthen my conclusion that voluntary assistance in persecution is required and that duress and coercion vitiate voluntariness.

The Fedorenko Courts construction of the DPA threatened to exclude from the United States concentration camp prisoners who were forced to assist the Nazis in the persecution of other prisoners. In my view, this construction was insupportablethe DPAs exclusion of persons who assisted the enemy in persecuting civil populations, Constitution of the International Refugee Organization, Annex I, Part II, §2(a),
62Stat.
3051, did not extend to concentration camp prisoners who did so involuntarily. These prisoners were victims, not persecutors.

Without an exception for involuntary action, the Refugee Acts bar would similarly treat entire classes of victims as persecutors. The Act does not support such a reading. The language of the persecutor bar is most naturally read to denote culpable conduct, and this reading is powerfully supported by the statutory context and legislative history.

As this Court has previously recognizedand as the majority acknowledges again todayCongress passed the Refugee Act to implement the United Nations Convention Relating to the Status of Refugees, 189 U. N. T. S. 150 (July 28, 1951) (hereinafter Convention), reprinted in 19 U. S. T. 6259, and the 1967 United Nations Protocol Relating to the Status of Refugees, Jan. 31, 1967, [1968] 19 U. S. T. 6223, T. I. A. S. No. 6577 (hereinafter Protocol). These treaties place a mandatory obligation on signatory states not to expel or return (refouler) a refugee in any manner whatsoever to … territories where his life or freedom would be threatened on account of his race, religion, nationality, membership of a particular social group or political opinion. Convention, Art. 33(1), 19 U. S. T., at 6276; Protocol, Art. I, 19 U. S. T., at 6225. The Refugee Acts withholding of removal provision specifically tracks this language.
8 U. S. C. §1231(b)(3)(A); see H. R. Rep. No. 96608, p. 18 (1979) (withholding of removal provision clearly reflects our legal obligations under international agreements, specifically Convention Article 33).6

The Convention excludes from the nonrefoulement obligation of Article 33 persons who have committed a crime against peace, a war crime, or a crime against humanity. Convention, Art. 1(F)(a), 19 U. S. T., at 6263. It is this exception that the persecutor bar reflects. See, e.g., H. R. Rep. No. 96608, at 18 (persecutor bar encompasses exceptions … provided in the Convention relating to aliens who have themselves participated in persecution); H. R. Conf. Rep. No. 96781, p. 20 (1980). The language of the Conventions exception is critical: We do not normally convict individuals of crimes when their actions are coerced or otherwise involuntary. Indeed, the United Nations Handbook, to which the Court has looked for guidance in the past, states that all relevant factors, including mitigating circumstances, must be considered in determining whether an aliens acts are of a criminal nature as contemplated by Article 1(F). Office of the United Nations High Commissioner for Refugees, Handbook on Procedures and Criteria for Determining Refugee Status ¶¶157, 162 (reedited Jan. 1992). Other states parties to the Convention and Protocol likewise read the Conventions exception as limited to culpable conduct.7 When we interpret treaties, we consider the interpretations of the courts of other nations, and we should do the same when Congress asks us to interpret a statute in light of a treatys language. See Zicherman v. Korean Air Lines Co.,
516 U. S. 217,
226228 (1996)
. Congress effort to conform United States law to the standard set forth in the U. N. Convention and Protocol shows that it intended the persecutor bar to apply only to culpable, voluntary actsand it underscores that Congress did not delegate the question presented by this case to the agency.

While I would hold that the persecutor bar does not automatically disqualify from asylum or withholding of removal an alien who acted involuntarily,8 I would leave for the Attorney Generaland, through his own delegation, the BIAthe question how the voluntariness standard should be applied. The agency would retain the ability, for instance, to define duress and coercion; to determine whether or not a balancing test should be employed; and, of course, to decide whether any individual asylum-seekers acts were covered by the persecutor bar. Those are the sorts of questions suited to the agencys unique competencies in administering the INA. The threshold question before the Court is not.

IV

Because I remain convinced that the narrower interpretation of Chevron endorsed by the Court in Cardoza-Fonseca was more faithful to the rationale of that case than the broader view the Court adopts today, I am unable to join its opinion. I would answer the question of law that this case presents with an unequivocal no and remand to the agency for further proceedings.

Notes

1 Notably, the EPA cast its activity not as statutory construction but as public administration; its rulemaking sought to achieve policy goals, such as reducing regulatory complexity and promoting plant modernization. See
46Fed. Reg.
50766 (1981). To be sure, the EPA argued that its regulation defining stationary source as an entire plant was permissible under the Clean Air Act, but the agency treated its rulemaking as a matter of fashioning sound policy, not of discerning the meaning of stationary source in the statute.

2 Cf. United States v. Mead Corp.,
533 U. S. 218,
236238 (2001)
; Barnhart v. Walton,
535 U. S. 212,
222 (2002)
(noting that Mead indicated that whether a court should give [Chevron] deference depends in significant part upon the interpretive method used and the nature of the question at issue).

3 The Administrative Procedure Act draws a similar distinction in providing that courts shall decide all relevant questions of law [and] interpret constitutional and statutory provisions but shall review agency action, findings, and conclusions under the arbitrary and capricious/abuse of discretion standard.
5 U. S. C. §706.

4 Justice Scalia objected in particular to the majoritys holding that pure questions of statutory construction are for the courts, not agencies, to decide; he insisted this was unfaithful to Chevron, since in Chevron the Court deferred to the Environmental Protection Agencys abstract interpretation of the phrase stationary source.  480 U. S., at 455 (opinion concurring in judgment). The majority rejected Justice Scalias argument, recognizing that Chevron involved an agencys complex policy judgment about how to fill a statutory gap, not a pure question of statutory construction. See 480 U. S., at 445448, and n. 29 (quoting extensively from Chevron).

5 The majority suggests that this approach is inconsistent with the  ordinary remand rule  articulated in Gonzales v. Thomas,
547 U. S. 183 (2006)
(per curiam), and INS v. Orlando Ventura,
537 U. S. 12 (2002)
(per curiam). Ante, at 1112. But those cases involved exactly the sort of application of law to fact that is within the agencys purview. In Thomas, the Court of Appeals decided that the family at issue fell within the scope of the statutory term particular social group.  547 U. S., at 185. We noted that the BIA had not considered this question, which require[d] determining the facts and deciding whether the facts as found f[e]ll within a statutory term. Id., at 186. Accordingly, we held that the court should have remanded to the agency. Similarly, in Ventura, the Court of Appeals addressed an issue that the BIA had not reached and concluded that conditions in Guatemala had so improved that no realistic threat of persecution currently existed. The Government argued that the court had not respected the BIAs role as fact-finder, 537 U. S., at 16, and we agreed, reversing the courts judgment insofar as it had not remanded to the agency.

6 Asylum and withholding of removal address concerns different from those addressed by the Convention Against Torture and Other Cruel, Inhuman, or Degrading Treatment or Punishment (CAT) and its implementing regulations. CAT, Dec. 10, 1984, S. Treaty Doc. No. 10020 (1988), 1465 U. N. T. S. 85; 8 CFR §§1208.161208.18 (2008). The CAT prohibits a state party from returning any person to a country where there is substantial reason to believe he might be tortured, but its definition of torture covers a narrower class of harms, imposed by a narrower class of actors, than the asylum and witholding of removal provisions. Most importantly, the CAT limits its definition of torture to acts inflicted by or at the instigation of or with the consent or acquiescence of a public official or other person acting in an official capacity, Pt. I, Art. 1, ¶1, p. 19, while asylum and withholding of removal are available to victims of harm inflicted by private actors, without regard to state involvement, see, e.g., In re Kasinga, 21 I. & N. Dec. 357, 365 (BIA 1996); In re H, 21 I. & N. Dec. 337, 343344 (BIA 1996).

8 Other considerations that are not presented in this case, such as an aliens lack of knowledge that he was involved in a persecutory act, could likewise indicate that he did not act with the requisite culpability. See, e.g., Castańeda-Castillo v. Gonzales, 488 F. 3d 17, 2022 (CA1 2007) (en banc); Hernandez v. Reno, 258 F. 3d 806, 814 (CA8 2001).

on writ of certiorari to the united states court ofappeals for the fifth circuit

[March 3, 2009]

Justice Stevens, with whom Justice Breyer joins, concurring in part and dissenting in part.

The narrow question of statutory construction presented by this case is whether the so-called persecutor bar,
8 U. S. C. §§1101(a)(42), disqualifies from asylum or withholding of removal an alien whose conduct was coerced or otherwise the product of duress. If the answer to that threshold question is no, courts should defer to the Attorney Generals evaluation of particular circumstances that may or may not establish duress or coercion in individual cases. But the threshold question the Court addresses today is a pure question of statutory construction for the courts to decide. INS v. Cardoza-Fonseca,
480 U. S. 421,
446 (1987)
. For that reason, while I agree with the Courts cogent explanation of why its misguided decision in Fedorenko v. United States,
449 U. S. 490 (1981)
, does not govern our interpretation of the persecutor bar, I would provide a definite answer to the question presented and then remand for further proceedings.

I

Judicial deference to agencies views on statutes they administer was not born in Chevron U. S. A. Inc. v. Natural Resources Defense Council, Inc.,
467 U. S. 837 (1984)
, nor did the singularly judicial role of marking the boundaries of agency choice, Young v. Community Nutrition Institute,
476 U. S. 974,
988 (1986)
(Stevens, J., dissenting), die with that case. In the years before Chevron, this Court recognized that statutory interpretation is a multifaceted enterprise, ranging from a precise construction of statutory language to a determination of what policy best effectuates statutory objectives. We accordingly acknowledged that a complete interpretation of a statutory provision might demand both judicial construction and administrative explication. E.g., NLRB v. Hearst Publications, Inc.,
322 U. S. 111 (1944)
(construing the term employee in the National Labor Relations Act but deferring to the National Labor Relations Boards finding that newsboys were employees); see Nathanson, Administrative Discretion in the Interpretation of Statutes, 3 Vand. L. Rev. 470 (1950).

Chevron adhered to this approach. There, we recognized that the Clean Air Act did not define stationary source,
42 U. S. C. §7502(b)(6) (1982 ed.), but rather implicitly delegated to the Environmental Protection Agency (EPA) the policy question whether States could treat entire plants or only their discrete pollution-emitting devices as sources of pollution for purposes of the Acts permit program. Congress left a gap for the agency to fill, and the agency brought its expertise, political acuity, and information-gathering abilities to bear in doing so.See Chevron, 467 U. S., at 865866.1 In keeping with precedent, see id., at 843845, and nn. 9, 1114, our opinion reaffirmed both that [t]he judiciary is the final authority on issues of statutory construction, id., at 843, n. 9, and that courts should defer to an agencys reasonable formulation of policy in response to an explicit or implicit congressional delegation of authority. The Chevron framework thus accounts for the different institutional competencies of agencies and courts: Courts are expert at statutory construction, while agencies are expert at statutory implementation. That the distinction can be subtle does not lessen its importance.

In the 25 years since Chevron was decided, this Court has continued to recognize that courts and agencies play complementary roles in the project of statutory interpretation. We have repeatedly held that ambiguities in statutes within an agencys jurisdiction to administer are delegations of authority to the agency to fill the statutory gap in reasonable fashion. National Cable & Telecommunications Assn. v. Brand X Internet Services,
545 U. S. 967,
980 (2005)
. But even when confronted with a statute that involves a degree of ambiguityas most statutes dowe have not abdicated our judicial role. The fact that Congress has left a gap for the agency to fill means that courts should defer to the agencys reasonable gap-filling decisions, not that courts should cease to mark the bounds of delegated agency choice.2

In cases involving agency adjudication, we have sometimes described the courts role as deciding pure questions of statutory construction and the agencys role as applying law to fact. See, e.g., Cardoza-Fonseca,
480 U. S. 421; NLRB v. Food & Commercial Workers,
484 U. S. 112 (1987)
; see also Republic of Austria v. Altmann,
541 U. S. 677,
701702 (2004)
. While this phrasing is peculiar to the adjudicatory context, the principle applies to Chevrons domain more broadly. In the context of agency rulemaking, for instance, we might distinguish between pure questions of statutory interpretation and policymaking, or between central legal issues and interstitial questions. See Barnhart v. Walton,
535 U. S. 212,
222 (2002)
.3 The label is immaterial. What matters is the principle: Certain aspects of statutory interpretation remain within the purview of the courts, even when the statute is not entirely clear, while others are properly understood as delegated by Congress to an expert and accountable administrative body. Statutory language may thus admit of both judicial construction and agency exposition.

II

Two of this Courts cases construing the Immigration and Nationality Act (INA),
66Stat.
166,
8 U. S. C. §1101et seq., illustrate the proper division of responsibility between courts and agencies and highlight when Chevron deference is appropriate and when it is not. In Cardoza-Fonseca,the question was whether the standard of INA §243(h),
8 U. S. C. §1253(h) (1982 ed.), which requires an alien to show that she is more likely than not to be subject to persecution if she is deported, also governs applications for asylum under §208(a),
8 U. S. C. §1158(a) (1982 ed.), which authorizes the Attorney General to grant asylum to an alien who has a well-founded fear of persecution in her home country. After considering the INAs language, its legislative history, and the United Nations Protocol that Congress had implemented, the Court determined that the two standards are not the same.

In so holding, we decisively rejected the Governments contention, echoed by Justice Scalias concurrence in the judgment, that the Board of Immigration Appeals (BIA) interpretation of the statute merited deference under our then-recent decision in Chevron. The question whether Congress intended the two standards to be identical is a pure question of statutory construction for the courts to decide, we stated. 480 U. S., at 446. We therefore did not defer to the BIAs interpretation of the two standards as equivalent but instead employed traditional tools of statutory construction and concluded that Congress did not intend the two standards to be identical. Ibid.4

Importantly, we recognized that Chevron deference need not be an all-or-nothing venture. Even after the question of the standards equivalency was resolved, there remained the question of their application. We explained, The narrow legal question whether the two standards are the same is, of course, quite different from the question of interpretation that arises in each case in which the agency is required to apply either or both standards to a particular set of facts. 480 U. S., at 448. And we noted that applying the INA was a task particularly suited to the agencys unique competencies:There is obviously some ambiguity in a term like well-founded fear which can only be given concrete meaning through a process of case-by-case adjudication. In that process of filling  any gap left, implicitly or explicitly by Congress,  the courts must respect the interpretation of the agency to which Congress has delegated the responsibility for administering the statutory program. Ibid. (quoting Chevron, 467 U. S., at 843, in turn quoting Morton v. Ruiz,
415 U. S. 199,
231 (1974)
).

In INS v. Aguirre-Aguirre,
526 U. S. 415 (1999)
, the Court encountered just the type of agency decision Cardoza-Fonseca indicated would warrant Chevron deference. The BIA had denied withholding of deportation because it found that the respondent had committed a serious nonpolitical crime before he entered the United States,
8 U. S. C. §1253(h)(2)(C) (1994 ed.). The Court of Appeals reversed the agencys decision and required it to supplement its balancing test with specific additional factors (such as whether the respondents acts were grossly out of proportion to their objective and whether the acts were politically necessary and successful).

We reversed the Court of Appeals, concluding that Chevron deference should be accorded to the BIA as it gives ambiguous statutory terms concrete meaning through a process of case-by-case adjudication.  526 U. S., at 425 (quoting Cardoza-Fonseca,480 U. S., at 448). The BIAs formulation of a test to apply the statutory standard in individual cases and its application of that test in respondents case were precisely the sort of agency actions that merited judicial deference.

III

The threshold question the Court addresses today is the kind of pure question of statutory construction for the courts to decide that we answered in Cardoza-Fonseca, id., at 446, rather than a fact-intensive question of the kind we addressed in Aguirre-Aguirre. Just as we decided the narrow legal question presented in Cardoza-Fonseca but did not attempt to set forth a detailed description of how the well-founded fear test should be applied, 480 U. S., at 448, I would decide the narrow legal question now before us and remand for the agency to determine how the persecutor bar applies in individual cases.5

For reasons similar to those set forth in my dissent in Fedorenko, I think it plain that the persecutor bar does not disqualify from asylum or withholding of removal an alien whose conduct was coerced or otherwise the product of duress. Although I agree in full with the Courts conclusion that the majority opinion in Fedorenko does not govern our interpretation of the persecutor bar, the differences the Court highlights between the Displaced Persons Act of 1948 (DPA),
62Stat.
1009, and the Refugee Act of 1980,
94Stat.
102, only strengthen my conclusion that voluntary assistance in persecution is required and that duress and coercion vitiate voluntariness.

The Fedorenko Courts construction of the DPA threatened to exclude from the United States concentration camp prisoners who were forced to assist the Nazis in the persecution of other prisoners. In my view, this construction was insupportablethe DPAs exclusion of persons who assisted the enemy in persecuting civil populations, Constitution of the International Refugee Organization, Annex I, Part II, §2(a),
62Stat.
3051, did not extend to concentration camp prisoners who did so involuntarily. These prisoners were victims, not persecutors.

Without an exception for involuntary action, the Refugee Acts bar would similarly treat entire classes of victims as persecutors. The Act does not support such a reading. The language of the persecutor bar is most naturally read to denote culpable conduct, and this reading is powerfully supported by the statutory context and legislative history.

As this Court has previously recognizedand as the majority acknowledges again todayCongress passed the Refugee Act to implement the United Nations Convention Relating to the Status of Refugees, 189 U. N. T. S. 150 (July 28, 1951) (hereinafter Convention), reprinted in 19 U. S. T. 6259, and the 1967 United Nations Protocol Relating to the Status of Refugees, Jan. 31, 1967, [1968] 19 U. S. T. 6223, T. I. A. S. No. 6577 (hereinafter Protocol). These treaties place a mandatory obligation on signatory states not to expel or return (refouler) a refugee in any manner whatsoever to … territories where his life or freedom would be threatened on account of his race, religion, nationality, membership of a particular social group or political opinion. Convention, Art. 33(1), 19 U. S. T., at 6276; Protocol, Art. I, 19 U. S. T., at 6225. The Refugee Acts withholding of removal provision specifically tracks this language.
8 U. S. C. §1231(b)(3)(A); see H. R. Rep. No. 96608, p. 18 (1979) (withholding of removal provision clearly reflects our legal obligations under international agreements, specifically Convention Article 33).6

The Convention excludes from the nonrefoulement obligation of Article 33 persons who have committed a crime against peace, a war crime, or a crime against humanity. Convention, Art. 1(F)(a), 19 U. S. T., at 6263. It is this exception that the persecutor bar reflects. See, e.g., H. R. Rep. No. 96608, at 18 (persecutor bar encompasses exceptions … provided in the Convention relating to aliens who have themselves participated in persecution); H. R. Conf. Rep. No. 96781, p. 20 (1980). The language of the Conventions exception is critical: We do not normally convict individuals of crimes when their actions are coerced or otherwise involuntary. Indeed, the United Nations Handbook, to which the Court has looked for guidance in the past, states that all relevant factors, including mitigating circumstances, must be considered in determining whether an aliens acts are of a criminal nature as contemplated by Article 1(F). Office of the United Nations High Commissioner for Refugees, Handbook on Procedures and Criteria for Determining Refugee Status ¶¶157, 162 (reedited Jan. 1992). Other states parties to the Convention and Protocol likewise read the Conventions exception as limited to culpable conduct.7 When we interpret treaties, we consider the interpretations of the courts of other nations, and we should do the same when Congress asks us to interpret a statute in light of a treatys language. See Zicherman v. Korean Air Lines Co.,
516 U. S. 217,
226228 (1996)
. Congress effort to conform United States law to the standard set forth in the U. N. Convention and Protocol shows that it intended the persecutor bar to apply only to culpable, voluntary actsand it underscores that Congress did not delegate the question presented by this case to the agency.

While I would hold that the persecutor bar does not automatically disqualify from asylum or withholding of removal an alien who acted involuntarily,8 I would leave for the Attorney Generaland, through his own delegation, the BIAthe question how the voluntariness standard should be applied. The agency would retain the ability, for instance, to define duress and coercion; to determine whether or not a balancing test should be employed; and, of course, to decide whether any individual asylum-seekers acts were covered by the persecutor bar. Those are the sorts of questions suited to the agencys unique competencies in administering the INA. The threshold question before the Court is not.

IV

Because I remain convinced that the narrower interpretation of Chevron endorsed by the Court in Cardoza-Fonseca was more faithful to the rationale of that case than the broader view the Court adopts today, I am unable to join its opinion. I would answer the question of law that this case presents with an unequivocal no and remand to the agency for further proceedings.

Notes

1 Notably, the EPA cast its activity not as statutory construction but as public administration; its rulemaking sought to achieve policy goals, such as reducing regulatory complexity and promoting plant modernization. See
46Fed. Reg.
50766 (1981). To be sure, the EPA argued that its regulation defining stationary source as an entire plant was permissible under the Clean Air Act, but the agency treated its rulemaking as a matter of fashioning sound policy, not of discerning the meaning of stationary source in the statute.

2 Cf. United States v. Mead Corp.,
533 U. S. 218,
236238 (2001)
; Barnhart v. Walton,
535 U. S. 212,
222 (2002)
(noting that Mead indicated that whether a court should give [Chevron] deference depends in significant part upon the interpretive method used and the nature of the question at issue).

3 The Administrative Procedure Act draws a similar distinction in providing that courts shall decide all relevant questions of law [and] interpret constitutional and statutory provisions but shall review agency action, findings, and conclusions under the arbitrary and capricious/abuse of discretion standard.
5 U. S. C. §706.

4 Justice Scalia objected in particular to the majoritys holding that pure questions of statutory construction are for the courts, not agencies, to decide; he insisted this was unfaithful to Chevron, since in Chevron the Court deferred to the Environmental Protection Agencys abstract interpretation of the phrase stationary source.  480 U. S., at 455 (opinion concurring in judgment). The majority rejected Justice Scalias argument, recognizing that Chevron involved an agencys complex policy judgment about how to fill a statutory gap, not a pure question of statutory construction. See 480 U. S., at 445448, and n. 29 (quoting extensively from Chevron).

5 The majority suggests that this approach is inconsistent with the  ordinary remand rule  articulated in Gonzales v. Thomas,
547 U. S. 183 (2006)
(per curiam), and INS v. Orlando Ventura,
537 U. S. 12 (2002)
(per curiam). Ante, at 1112. But those cases involved exactly the sort of application of law to fact that is within the agencys purview. In Thomas, the Court of Appeals decided that the family at issue fell within the scope of the statutory term particular social group.  547 U. S., at 185. We noted that the BIA had not considered this question, which require[d] determining the facts and deciding whether the facts as found f[e]ll within a statutory term. Id., at 186. Accordingly, we held that the court should have remanded to the agency. Similarly, in Ventura, the Court of Appeals addressed an issue that the BIA had not reached and concluded that conditions in Guatemala had so improved that no realistic threat of persecution currently existed. The Government argued that the court had not respected the BIAs role as fact-finder, 537 U. S., at 16, and we agreed, reversing the courts judgment insofar as it had not remanded to the agency.

6 Asylum and withholding of removal address concerns different from those addressed by the Convention Against Torture and Other Cruel, Inhuman, or Degrading Treatment or Punishment (CAT) and its implementing regulations. CAT, Dec. 10, 1984, S. Treaty Doc. No. 10020 (1988), 1465 U. N. T. S. 85; 8 CFR §§1208.161208.18 (2008). The CAT prohibits a state party from returning any person to a country where there is substantial reason to believe he might be tortured, but its definition of torture covers a narrower class of harms, imposed by a narrower class of actors, than the asylum and witholding of removal provisions. Most importantly, the CAT limits its definition of torture to acts inflicted by or at the instigation of or with the consent or acquiescence of a public official or other person acting in an official capacity, Pt. I, Art. 1, ¶1, p. 19, while asylum and withholding of removal are available to victims of harm inflicted by private actors, without regard to state involvement, see, e.g., In re Kasinga, 21 I. & N. Dec. 357, 365 (BIA 1996); In re H, 21 I. & N. Dec. 337, 343344 (BIA 1996).

8 Other considerations that are not presented in this case, such as an aliens lack of knowledge that he was involved in a persecutory act, could likewise indicate that he did not act with the requisite culpability. See, e.g., Castańeda-Castillo v. Gonzales, 488 F. 3d 17, 2022 (CA1 2007) (en banc); Hernandez v. Reno, 258 F. 3d 806, 814 (CA8 2001).

on writ of certiorari to the united states court ofappeals for the fifth circuit

[March 3, 2009]

Justice Stevens, with whom Justice Breyer joins, concurring in part and dissenting in part.

The narrow question of statutory construction presented by this case is whether the so-called persecutor bar,
8 U. S. C. §§1101(a)(42), disqualifies from asylum or withholding of removal an alien whose conduct was coerced or otherwise the product of duress. If the answer to that threshold question is no, courts should defer to the Attorney Generals evaluation of particular circumstances that may or may not establish duress or coercion in individual cases. But the threshold question the Court addresses today is a pure question of statutory construction for the courts to decide. INS v. Cardoza-Fonseca,
480 U. S. 421,
446 (1987)
. For that reason, while I agree with the Courts cogent explanation of why its misguided decision in Fedorenko v. United States,
449 U. S. 490 (1981)
, does not govern our interpretation of the persecutor bar, I would provide a definite answer to the question presented and then remand for further proceedings.

I

Judicial deference to agencies views on statutes they administer was not born in Chevron U. S. A. Inc. v. Natural Resources Defense Council, Inc.,
467 U. S. 837 (1984)
, nor did the singularly judicial role of marking the boundaries of agency choice, Young v. Community Nutrition Institute,
476 U. S. 974,
988 (1986)
(Stevens, J., dissenting), die with that case. In the years before Chevron, this Court recognized that statutory interpretation is a multifaceted enterprise, ranging from a precise construction of statutory language to a determination of what policy best effectuates statutory objectives. We accordingly acknowledged that a complete interpretation of a statutory provision might demand both judicial construction and administrative explication. E.g., NLRB v. Hearst Publications, Inc.,
322 U. S. 111 (1944)
(construing the term employee in the National Labor Relations Act but deferring to the National Labor Relations Boards finding that newsboys were employees); see Nathanson, Administrative Discretion in the Interpretation of Statutes, 3 Vand. L. Rev. 470 (1950).

Chevron adhered to this approach. There, we recognized that the Clean Air Act did not define stationary source,
42 U. S. C. §7502(b)(6) (1982 ed.), but rather implicitly delegated to the Environmental Protection Agency (EPA) the policy question whether States could treat entire plants or only their discrete pollution-emitting devices as sources of pollution for purposes of the Acts permit program. Congress left a gap for the agency to fill, and the agency brought its expertise, political acuity, and information-gathering abilities to bear in doing so.See Chevron, 467 U. S., at 865866.1 In keeping with precedent, see id., at 843845, and nn. 9, 1114, our opinion reaffirmed both that [t]he judiciary is the final authority on issues of statutory construction, id., at 843, n. 9, and that courts should defer to an agencys reasonable formulation of policy in response to an explicit or implicit congressional delegation of authority. The Chevron framework thus accounts for the different institutional competencies of agencies and courts: Courts are expert at statutory construction, while agencies are expert at statutory implementation. That the distinction can be subtle does not lessen its importance.

In the 25 years since Chevron was decided, this Court has continued to recognize that courts and agencies play complementary roles in the project of statutory interpretation. We have repeatedly held that ambiguities in statutes within an agencys jurisdiction to administer are delegations of authority to the agency to fill the statutory gap in reasonable fashion. National Cable & Telecommunications Assn. v. Brand X Internet Services,
545 U. S. 967,
980 (2005)
. But even when confronted with a statute that involves a degree of ambiguityas most statutes dowe have not abdicated our judicial role. The fact that Congress has left a gap for the agency to fill means that courts should defer to the agencys reasonable gap-filling decisions, not that courts should cease to mark the bounds of delegated agency choice.2

In cases involving agency adjudication, we have sometimes described the courts role as deciding pure questions of statutory construction and the agencys role as applying law to fact. See, e.g., Cardoza-Fonseca,
480 U. S. 421; NLRB v. Food & Commercial Workers,
484 U. S. 112 (1987)
; see also Republic of Austria v. Altmann,
541 U. S. 677,
701702 (2004)
. While this phrasing is peculiar to the adjudicatory context, the principle applies to Chevrons domain more broadly. In the context of agency rulemaking, for instance, we might distinguish between pure questions of statutory interpretation and policymaking, or between central legal issues and interstitial questions. See Barnhart v. Walton,
535 U. S. 212,
222 (2002)
.3 The label is immaterial. What matters is the principle: Certain aspects of statutory interpretation remain within the purview of the courts, even when the statute is not entirely clear, while others are properly understood as delegated by Congress to an expert and accountable administrative body. Statutory language may thus admit of both judicial construction and agency exposition.

II

Two of this Courts cases construing the Immigration and Nationality Act (INA),
66Stat.
166,
8 U. S. C. §1101et seq., illustrate the proper division of responsibility between courts and agencies and highlight when Chevron deference is appropriate and when it is not. In Cardoza-Fonseca,the question was whether the standard of INA §243(h),
8 U. S. C. §1253(h) (1982 ed.), which requires an alien to show that she is more likely than not to be subject to persecution if she is deported, also governs applications for asylum under §208(a),
8 U. S. C. §1158(a) (1982 ed.), which authorizes the Attorney General to grant asylum to an alien who has a well-founded fear of persecution in her home country. After considering the INAs language, its legislative history, and the United Nations Protocol that Congress had implemented, the Court determined that the two standards are not the same.

In so holding, we decisively rejected the Governments contention, echoed by Justice Scalias concurrence in the judgment, that the Board of Immigration Appeals (BIA) interpretation of the statute merited deference under our then-recent decision in Chevron. The question whether Congress intended the two standards to be identical is a pure question of statutory construction for the courts to decide, we stated. 480 U. S., at 446. We therefore did not defer to the BIAs interpretation of the two standards as equivalent but instead employed traditional tools of statutory construction and concluded that Congress did not intend the two standards to be identical. Ibid.4

Importantly, we recognized that Chevron deference need not be an all-or-nothing venture. Even after the question of the standards equivalency was resolved, there remained the question of their application. We explained, The narrow legal question whether the two standards are the same is, of course, quite different from the question of interpretation that arises in each case in which the agency is required to apply either or both standards to a particular set of facts. 480 U. S., at 448. And we noted that applying the INA was a task particularly suited to the agencys unique competencies:There is obviously some ambiguity in a term like well-founded fear which can only be given concrete meaning through a process of case-by-case adjudication. In that process of filling  any gap left, implicitly or explicitly by Congress,  the courts must respect the interpretation of the agency to which Congress has delegated the responsibility for administering the statutory program. Ibid. (quoting Chevron, 467 U. S., at 843, in turn quoting Morton v. Ruiz,
415 U. S. 199,
231 (1974)
).

In INS v. Aguirre-Aguirre,
526 U. S. 415 (1999)
, the Court encountered just the type of agency decision Cardoza-Fonseca indicated would warrant Chevron deference. The BIA had denied withholding of deportation because it found that the respondent had committed a serious nonpolitical crime before he entered the United States,
8 U. S. C. §1253(h)(2)(C) (1994 ed.). The Court of Appeals reversed the agencys decision and required it to supplement its balancing test with specific additional factors (such as whether the respondents acts were grossly out of proportion to their objective and whether the acts were politically necessary and successful).

We reversed the Court of Appeals, concluding that Chevron deference should be accorded to the BIA as it gives ambiguous statutory terms concrete meaning through a process of case-by-case adjudication.  526 U. S., at 425 (quoting Cardoza-Fonseca,480 U. S., at 448). The BIAs formulation of a test to apply the statutory standard in individual cases and its application of that test in respondents case were precisely the sort of agency actions that merited judicial deference.

III

The threshold question the Court addresses today is the kind of pure question of statutory construction for the courts to decide that we answered in Cardoza-Fonseca, id., at 446, rather than a fact-intensive question of the kind we addressed in Aguirre-Aguirre. Just as we decided the narrow legal question presented in Cardoza-Fonseca but did not attempt to set forth a detailed description of how the well-founded fear test should be applied, 480 U. S., at 448, I would decide the narrow legal question now before us and remand for the agency to determine how the persecutor bar applies in individual cases.5

For reasons similar to those set forth in my dissent in Fedorenko, I think it plain that the persecutor bar does not disqualify from asylum or withholding of removal an alien whose conduct was coerced or otherwise the product of duress. Although I agree in full with the Courts conclusion that the majority opinion in Fedorenko does not govern our interpretation of the persecutor bar, the differences the Court highlights between the Displaced Persons Act of 1948 (DPA),
62Stat.
1009, and the Refugee Act of 1980,
94Stat.
102, only strengthen my conclusion that voluntary assistance in persecution is required and that duress and coercion vitiate voluntariness.

The Fedorenko Courts construction of the DPA threatened to exclude from the United States concentration camp prisoners who were forced to assist the Nazis in the persecution of other prisoners. In my view, this construction was insupportablethe DPAs exclusion of persons who assisted the enemy in persecuting civil populations, Constitution of the International Refugee Organization, Annex I, Part II, §2(a),
62Stat.
3051, did not extend to concentration camp prisoners who did so involuntarily. These prisoners were victims, not persecutors.

Without an exception for involuntary action, the Refugee Acts bar would similarly treat entire classes of victims as persecutors. The Act does not support such a reading. The language of the persecutor bar is most naturally read to denote culpable conduct, and this reading is powerfully supported by the statutory context and legislative history.

As this Court has previously recognizedand as the majority acknowledges again todayCongress passed the Refugee Act to implement the United Nations Convention Relating to the Status of Refugees, 189 U. N. T. S. 150 (July 28, 1951) (hereinafter Convention), reprinted in 19 U. S. T. 6259, and the 1967 United Nations Protocol Relating to the Status of Refugees, Jan. 31, 1967, [1968] 19 U. S. T. 6223, T. I. A. S. No. 6577 (hereinafter Protocol). These treaties place a mandatory obligation on signatory states not to expel or return (refouler) a refugee in any manner whatsoever to … territories where his life or freedom would be threatened on account of his race, religion, nationality, membership of a particular social group or political opinion. Convention, Art. 33(1), 19 U. S. T., at 6276; Protocol, Art. I, 19 U. S. T., at 6225. The Refugee Acts withholding of removal provision specifically tracks this language.
8 U. S. C. §1231(b)(3)(A); see H. R. Rep. No. 96608, p. 18 (1979) (withholding of removal provision clearly reflects our legal obligations under international agreements, specifically Convention Article 33).6

The Convention excludes from the nonrefoulement obligation of Article 33 persons who have committed a crime against peace, a war crime, or a crime against humanity. Convention, Art. 1(F)(a), 19 U. S. T., at 6263. It is this exception that the persecutor bar reflects. See, e.g., H. R. Rep. No. 96608, at 18 (persecutor bar encompasses exceptions … provided in the Convention relating to aliens who have themselves participated in persecution); H. R. Conf. Rep. No. 96781, p. 20 (1980). The language of the Conventions exception is critical: We do not normally convict individuals of crimes when their actions are coerced or otherwise involuntary. Indeed, the United Nations Handbook, to which the Court has looked for guidance in the past, states that all relevant factors, including mitigating circumstances, must be considered in determining whether an aliens acts are of a criminal nature as contemplated by Article 1(F). Office of the United Nations High Commissioner for Refugees, Handbook on Procedures and Criteria for Determining Refugee Status ¶¶157, 162 (reedited Jan. 1992). Other states parties to the Convention and Protocol likewise read the Conventions exception as limited to culpable conduct.7 When we interpret treaties, we consider the interpretations of the courts of other nations, and we should do the same when Congress asks us to interpret a statute in light of a treatys language. See Zicherman v. Korean Air Lines Co.,
516 U. S. 217,
226228 (1996)
. Congress effort to conform United States law to the standard set forth in the U. N. Convention and Protocol shows that it intended the persecutor bar to apply only to culpable, voluntary actsand it underscores that Congress did not delegate the question presented by this case to the agency.

While I would hold that the persecutor bar does not automatically disqualify from asylum or withholding of removal an alien who acted involuntarily,8 I would leave for the Attorney Generaland, through his own delegation, the BIAthe question how the voluntariness standard should be applied. The agency would retain the ability, for instance, to define duress and coercion; to determine whether or not a balancing test should be employed; and, of course, to decide whether any individual asylum-seekers acts were covered by the persecutor bar. Those are the sorts of questions suited to the agencys unique competencies in administering the INA. The threshold question before the Court is not.

IV

Because I remain convinced that the narrower interpretation of Chevron endorsed by the Court in Cardoza-Fonseca was more faithful to the rationale of that case than the broader view the Court adopts today, I am unable to join its opinion. I would answer the question of law that this case presents with an unequivocal no and remand to the agency for further proceedings.

Notes

1 Notably, the EPA cast its activity not as statutory construction but as public administration; its rulemaking sought to achieve policy goals, such as reducing regulatory complexity and promoting plant modernization. See
46Fed. Reg.
50766 (1981). To be sure, the EPA argued that its regulation defining stationary source as an entire plant was permissible under the Clean Air Act, but the agency treated its rulemaking as a matter of fashioning sound policy, not of discerning the meaning of stationary source in the statute.

2 Cf. United States v. Mead Corp.,
533 U. S. 218,
236238 (2001)
; Barnhart v. Walton,
535 U. S. 212,
222 (2002)
(noting that Mead indicated that whether a court should give [Chevron] deference depends in significant part upon the interpretive method used and the nature of the question at issue).

3 The Administrative Procedure Act draws a similar distinction in providing that courts shall decide all relevant questions of law [and] interpret constitutional and statutory provisions but shall review agency action, findings, and conclusions under the arbitrary and capricious/abuse of discretion standard.
5 U. S. C. §706.

4 Justice Scalia objected in particular to the majoritys holding that pure questions of statutory construction are for the courts, not agencies, to decide; he insisted this was unfaithful to Chevron, since in Chevron the Court deferred to the Environmental Protection Agencys abstract interpretation of the phrase stationary source.  480 U. S., at 455 (opinion concurring in judgment). The majority rejected Justice Scalias argument, recognizing that Chevron involved an agencys complex policy judgment about how to fill a statutory gap, not a pure question of statutory construction. See 480 U. S., at 445448, and n. 29 (quoting extensively from Chevron).

5 The majority suggests that this approach is inconsistent with the  ordinary remand rule  articulated in Gonzales v. Thomas,
547 U. S. 183 (2006)
(per curiam), and INS v. Orlando Ventura,
537 U. S. 12 (2002)
(per curiam). Ante, at 1112. But those cases involved exactly the sort of application of law to fact that is within the agencys purview. In Thomas, the Court of Appeals decided that the family at issue fell within the scope of the statutory term particular social group.  547 U. S., at 185. We noted that the BIA had not considered this question, which require[d] determining the facts and deciding whether the facts as found f[e]ll within a statutory term. Id., at 186. Accordingly, we held that the court should have remanded to the agency. Similarly, in Ventura, the Court of Appeals addressed an issue that the BIA had not reached and concluded that conditions in Guatemala had so improved that no realistic threat of persecution currently existed. The Government argued that the court had not respected the BIAs role as fact-finder, 537 U. S., at 16, and we agreed, reversing the courts judgment insofar as it had not remanded to the agency.

6 Asylum and withholding of removal address concerns different from those addressed by the Convention Against Torture and Other Cruel, Inhuman, or Degrading Treatment or Punishment (CAT) and its implementing regulations. CAT, Dec. 10, 1984, S. Treaty Doc. No. 10020 (1988), 1465 U. N. T. S. 85; 8 CFR §§1208.161208.18 (2008). The CAT prohibits a state party from returning any person to a country where there is substantial reason to believe he might be tortured, but its definition of torture covers a narrower class of harms, imposed by a narrower class of actors, than the asylum and witholding of removal provisions. Most importantly, the CAT limits its definition of torture to acts inflicted by or at the instigation of or with the consent or acquiescence of a public official or other person acting in an official capacity, Pt. I, Art. 1, ¶1, p. 19, while asylum and withholding of removal are available to victims of harm inflicted by private actors, without regard to state involvement, see, e.g., In re Kasinga, 21 I. & N. Dec. 357, 365 (BIA 1996); In re H, 21 I. & N. Dec. 337, 343344 (BIA 1996).

8 Other considerations that are not presented in this case, such as an aliens lack of knowledge that he was involved in a persecutory act, could likewise indicate that he did not act with the requisite culpability. See, e.g., Castańeda-Castillo v. Gonzales, 488 F. 3d 17, 2022 (CA1 2007) (en banc); Hernandez v. Reno, 258 F. 3d 806, 814 (CA8 2001).

on writ of certiorari to the united states court ofappeals for the fifth circuit

[March 3, 2009]

Justice Stevens, with whom Justice Breyer joins, concurring in part and dissenting in part.

The narrow question of statutory construction presented by this case is whether the so-called persecutor bar,
8 U. S. C. §§1101(a)(42), disqualifies from asylum or withholding of removal an alien whose conduct was coerced or otherwise the product of duress. If the answer to that threshold question is no, courts should defer to the Attorney Generals evaluation of particular circumstances that may or may not establish duress or coercion in individual cases. But the threshold question the Court addresses today is a pure question of statutory construction for the courts to decide. INS v. Cardoza-Fonseca,
480 U. S. 421,
446 (1987)
. For that reason, while I agree with the Courts cogent explanation of why its misguided decision in Fedorenko v. United States,
449 U. S. 490 (1981)
, does not govern our interpretation of the persecutor bar, I would provide a definite answer to the question presented and then remand for further proceedings.

I

Judicial deference to agencies views on statutes they administer was not born in Chevron U. S. A. Inc. v. Natural Resources Defense Council, Inc.,
467 U. S. 837 (1984)
, nor did the singularly judicial role of marking the boundaries of agency choice, Young v. Community Nutrition Institute,
476 U. S. 974,
988 (1986)
(Stevens, J., dissenting), die with that case. In the years before Chevron, this Court recognized that statutory interpretation is a multifaceted enterprise, ranging from a precise construction of statutory language to a determination of what policy best effectuates statutory objectives. We accordingly acknowledged that a complete interpretation of a statutory provision might demand both judicial construction and administrative explication. E.g., NLRB v. Hearst Publications, Inc.,
322 U. S. 111 (1944)
(construing the term employee in the National Labor Relations Act but deferring to the National Labor Relations Boards finding that newsboys were employees); see Nathanson, Administrative Discretion in the Interpretation of Statutes, 3 Vand. L. Rev. 470 (1950).

Chevron adhered to this approach. There, we recognized that the Clean Air Act did not define stationary source,
42 U. S. C. §7502(b)(6) (1982 ed.), but rather implicitly delegated to the Environmental Protection Agency (EPA) the policy question whether States could treat entire plants or only their discrete pollution-emitting devices as sources of pollution for purposes of the Acts permit program. Congress left a gap for the agency to fill, and the agency brought its expertise, political acuity, and information-gathering abilities to bear in doing so.See Chevron, 467 U. S., at 865866.1 In keeping with precedent, see id., at 843845, and nn. 9, 1114, our opinion reaffirmed both that [t]he judiciary is the final authority on issues of statutory construction, id., at 843, n. 9, and that courts should defer to an agencys reasonable formulation of policy in response to an explicit or implicit congressional delegation of authority. The Chevron framework thus accounts for the different institutional competencies of agencies and courts: Courts are expert at statutory construction, while agencies are expert at statutory implementation. That the distinction can be subtle does not lessen its importance.

In the 25 years since Chevron was decided, this Court has continued to recognize that courts and agencies play complementary roles in the project of statutory interpretation. We have repeatedly held that ambiguities in statutes within an agencys jurisdiction to administer are delegations of authority to the agency to fill the statutory gap in reasonable fashion. National Cable & Telecommunications Assn. v. Brand X Internet Services,
545 U. S. 967,
980 (2005)
. But even when confronted with a statute that involves a degree of ambiguityas most statutes dowe have not abdicated our judicial role. The fact that Congress has left a gap for the agency to fill means that courts should defer to the agencys reasonable gap-filling decisions, not that courts should cease to mark the bounds of delegated agency choice.2

In cases involving agency adjudication, we have sometimes described the courts role as deciding pure questions of statutory construction and the agencys role as applying law to fact. See, e.g., Cardoza-Fonseca,
480 U. S. 421; NLRB v. Food & Commercial Workers,
484 U. S. 112 (1987)
; see also Republic of Austria v. Altmann,
541 U. S. 677,
701702 (2004)
. While this phrasing is peculiar to the adjudicatory context, the principle applies to Chevrons domain more broadly. In the context of agency rulemaking, for instance, we might distinguish between pure questions of statutory interpretation and policymaking, or between central legal issues and interstitial questions. See Barnhart v. Walton,
535 U. S. 212,
222 (2002)
.3 The label is immaterial. What matters is the principle: Certain aspects of statutory interpretation remain within the purview of the courts, even when the statute is not entirely clear, while others are properly understood as delegated by Congress to an expert and accountable administrative body. Statutory language may thus admit of both judicial construction and agency exposition.

II

Two of this Courts cases construing the Immigration and Nationality Act (INA),
66Stat.
166,
8 U. S. C. §1101et seq., illustrate the proper division of responsibility between courts and agencies and highlight when Chevron deference is appropriate and when it is not. In Cardoza-Fonseca,the question was whether the standard of INA §243(h),
8 U. S. C. §1253(h) (1982 ed.), which requires an alien to show that she is more likely than not to be subject to persecution if she is deported, also governs applications for asylum under §208(a),
8 U. S. C. §1158(a) (1982 ed.), which authorizes the Attorney General to grant asylum to an alien who has a well-founded fear of persecution in her home country. After considering the INAs language, its legislative history, and the United Nations Protocol that Congress had implemented, the Court determined that the two standards are not the same.

In so holding, we decisively rejected the Governments contention, echoed by Justice Scalias concurrence in the judgment, that the Board of Immigration Appeals (BIA) interpretation of the statute merited deference under our then-recent decision in Chevron. The question whether Congress intended the two standards to be identical is a pure question of statutory construction for the courts to decide, we stated. 480 U. S., at 446. We therefore did not defer to the BIAs interpretation of the two standards as equivalent but instead employed traditional tools of statutory construction and concluded that Congress did not intend the two standards to be identical. Ibid.4

Importantly, we recognized that Chevron deference need not be an all-or-nothing venture. Even after the question of the standards equivalency was resolved, there remained the question of their application. We explained, The narrow legal question whether the two standards are the same is, of course, quite different from the question of interpretation that arises in each case in which the agency is required to apply either or both standards to a particular set of facts. 480 U. S., at 448. And we noted that applying the INA was a task particularly suited to the agencys unique competencies:There is obviously some ambiguity in a term like well-founded fear which can only be given concrete meaning through a process of case-by-case adjudication. In that process of filling  any gap left, implicitly or explicitly by Congress,  the courts must respect the interpretation of the agency to which Congress has delegated the responsibility for administering the statutory program. Ibid. (quoting Chevron, 467 U. S., at 843, in turn quoting Morton v. Ruiz,
415 U. S. 199,
231 (1974)
).

In INS v. Aguirre-Aguirre,
526 U. S. 415 (1999)
, the Court encountered just the type of agency decision Cardoza-Fonseca indicated would warrant Chevron deference. The BIA had denied withholding of deportation because it found that the respondent had committed a serious nonpolitical crime before he entered the United States,
8 U. S. C. §1253(h)(2)(C) (1994 ed.). The Court of Appeals reversed the agencys decision and required it to supplement its balancing test with specific additional factors (such as whether the respondents acts were grossly out of proportion to their objective and whether the acts were politically necessary and successful).

We reversed the Court of Appeals, concluding that Chevron deference should be accorded to the BIA as it gives ambiguous statutory terms concrete meaning through a process of case-by-case adjudication.  526 U. S., at 425 (quoting Cardoza-Fonseca,480 U. S., at 448). The BIAs formulation of a test to apply the statutory standard in individual cases and its application of that test in respondents case were precisely the sort of agency actions that merited judicial deference.

III

The threshold question the Court addresses today is the kind of pure question of statutory construction for the courts to decide that we answered in Cardoza-Fonseca, id., at 446, rather than a fact-intensive question of the kind we addressed in Aguirre-Aguirre. Just as we decided the narrow legal question presented in Cardoza-Fonseca but did not attempt to set forth a detailed description of how the well-founded fear test should be applied, 480 U. S., at 448, I would decide the narrow legal question now before us and remand for the agency to determine how the persecutor bar applies in individual cases.5

For reasons similar to those set forth in my dissent in Fedorenko, I think it plain that the persecutor bar does not disqualify from asylum or withholding of removal an alien whose conduct was coerced or otherwise the product of duress. Although I agree in full with the Courts conclusion that the majority opinion in Fedorenko does not govern our interpretation of the persecutor bar, the differences the Court highlights between the Displaced Persons Act of 1948 (DPA),
62Stat.
1009, and the Refugee Act of 1980,
94Stat.
102, only strengthen my conclusion that voluntary assistance in persecution is required and that duress and coercion vitiate voluntariness.

The Fedorenko Courts construction of the DPA threatened to exclude from the United States concentration camp prisoners who were forced to assist the Nazis in the persecution of other prisoners. In my view, this construction was insupportablethe DPAs exclusion of persons who assisted the enemy in persecuting civil populations, Constitution of the International Refugee Organization, Annex I, Part II, §2(a),
62Stat.
3051, did not extend to concentration camp prisoners who did so involuntarily. These prisoners were victims, not persecutors.

Without an exception for involuntary action, the Refugee Acts bar would similarly treat entire classes of victims as persecutors. The Act does not support such a reading. The language of the persecutor bar is most naturally read to denote culpable conduct, and this reading is powerfully supported by the statutory context and legislative history.

As this Court has previously recognizedand as the majority acknowledges again todayCongress passed the Refugee Act to implement the United Nations Convention Relating to the Status of Refugees, 189 U. N. T. S. 150 (July 28, 1951) (hereinafter Convention), reprinted in 19 U. S. T. 6259, and the 1967 United Nations Protocol Relating to the Status of Refugees, Jan. 31, 1967, [1968] 19 U. S. T. 6223, T. I. A. S. No. 6577 (hereinafter Protocol). These treaties place a mandatory obligation on signatory states not to expel or return (refouler) a refugee in any manner whatsoever to … territories where his life or freedom would be threatened on account of his race, religion, nationality, membership of a particular social group or political opinion. Convention, Art. 33(1), 19 U. S. T., at 6276; Protocol, Art. I, 19 U. S. T., at 6225. The Refugee Acts withholding of removal provision specifically tracks this language.
8 U. S. C. §1231(b)(3)(A); see H. R. Rep. No. 96608, p. 18 (1979) (withholding of removal provision clearly reflects our legal obligations under international agreements, specifically Convention Article 33).6

The Convention excludes from the nonrefoulement obligation of Article 33 persons who have committed a crime against peace, a war crime, or a crime against humanity. Convention, Art. 1(F)(a), 19 U. S. T., at 6263. It is this exception that the persecutor bar reflects. See, e.g., H. R. Rep. No. 96608, at 18 (persecutor bar encompasses exceptions … provided in the Convention relating to aliens who have themselves participated in persecution); H. R. Conf. Rep. No. 96781, p. 20 (1980). The language of the Conventions exception is critical: We do not normally convict individuals of crimes when their actions are coerced or otherwise involuntary. Indeed, the United Nations Handbook, to which the Court has looked for guidance in the past, states that all relevant factors, including mitigating circumstances, must be considered in determining whether an aliens acts are of a criminal nature as contemplated by Article 1(F). Office of the United Nations High Commissioner for Refugees, Handbook on Procedures and Criteria for Determining Refugee Status ¶¶157, 162 (reedited Jan. 1992). Other states parties to the Convention and Protocol likewise read the Conventions exception as limited to culpable conduct.7 When we interpret treaties, we consider the interpretations of the courts of other nations, and we should do the same when Congress asks us to interpret a statute in light of a treatys language. See Zicherman v. Korean Air Lines Co.,
516 U. S. 217,
226228 (1996)
. Congress effort to conform United States law to the standard set forth in the U. N. Convention and Protocol shows that it intended the persecutor bar to apply only to culpable, voluntary actsand it underscores that Congress did not delegate the question presented by this case to the agency.

While I would hold that the persecutor bar does not automatically disqualify from asylum or withholding of removal an alien who acted involuntarily,8 I would leave for the Attorney Generaland, through his own delegation, the BIAthe question how the voluntariness standard should be applied. The agency would retain the ability, for instance, to define duress and coercion; to determine whether or not a balancing test should be employed; and, of course, to decide whether any individual asylum-seekers acts were covered by the persecutor bar. Those are the sorts of questions suited to the agencys unique competencies in administering the INA. The threshold question before the Court is not.

IV

Because I remain convinced that the narrower interpretation of Chevron endorsed by the Court in Cardoza-Fonseca was more faithful to the rationale of that case than the broader view the Court adopts today, I am unable to join its opinion. I would answer the question of law that this case presents with an unequivocal no and remand to the agency for further proceedings.

Notes

1 Notably, the EPA cast its activity not as statutory construction but as public administration; its rulemaking sought to achieve policy goals, such as reducing regulatory complexity and promoting plant modernization. See
46Fed. Reg.
50766 (1981). To be sure, the EPA argued that its regulation defining stationary source as an entire plant was permissible under the Clean Air Act, but the agency treated its rulemaking as a matter of fashioning sound policy, not of discerning the meaning of stationary source in the statute.

2 Cf. United States v. Mead Corp.,
533 U. S. 218,
236238 (2001)
; Barnhart v. Walton,
535 U. S. 212,
222 (2002)
(noting that Mead indicated that whether a court should give [Chevron] deference depends in significant part upon the interpretive method used and the nature of the question at issue).

3 The Administrative Procedure Act draws a similar distinction in providing that courts shall decide all relevant questions of law [and] interpret constitutional and statutory provisions but shall review agency action, findings, and conclusions under the arbitrary and capricious/abuse of discretion standard.
5 U. S. C. §706.

4 Justice Scalia objected in particular to the majoritys holding that pure questions of statutory construction are for the courts, not agencies, to decide; he insisted this was unfaithful to Chevron, since in Chevron the Court deferred to the Environmental Protection Agencys abstract interpretation of the phrase stationary source.  480 U. S., at 455 (opinion concurring in judgment). The majority rejected Justice Scalias argument, recognizing that Chevron involved an agencys complex policy judgment about how to fill a statutory gap, not a pure question of statutory construction. See 480 U. S., at 445448, and n. 29 (quoting extensively from Chevron).

5 The majority suggests that this approach is inconsistent with the  ordinary remand rule  articulated in Gonzales v. Thomas,
547 U. S. 183 (2006)
(per curiam), and INS v. Orlando Ventura,
537 U. S. 12 (2002)
(per curiam). Ante, at 1112. But those cases involved exactly the sort of application of law to fact that is within the agencys purview. In Thomas, the Court of Appeals decided that the family at issue fell within the scope of the statutory term particular social group.  547 U. S., at 185. We noted that the BIA had not considered this question, which require[d] determining the facts and deciding whether the facts as found f[e]ll within a statutory term. Id., at 186. Accordingly, we held that the court should have remanded to the agency. Similarly, in Ventura, the Court of Appeals addressed an issue that the BIA had not reached and concluded that conditions in Guatemala had so improved that no realistic threat of persecution currently existed. The Government argued that the court had not respected the BIAs role as fact-finder, 537 U. S., at 16, and we agreed, reversing the courts judgment insofar as it had not remanded to the agency.

6 Asylum and withholding of removal address concerns different from those addressed by the Convention Against Torture and Other Cruel, Inhuman, or Degrading Treatment or Punishment (CAT) and its implementing regulations. CAT, Dec. 10, 1984, S. Treaty Doc. No. 10020 (1988), 1465 U. N. T. S. 85; 8 CFR §§1208.161208.18 (2008). The CAT prohibits a state party from returning any person to a country where there is substantial reason to believe he might be tortured, but its definition of torture covers a narrower class of harms, imposed by a narrower class of actors, than the asylum and witholding of removal provisions. Most importantly, the CAT limits its definition of torture to acts inflicted by or at the instigation of or with the consent or acquiescence of a public official or other person acting in an official capacity, Pt. I, Art. 1, ¶1, p. 19, while asylum and withholding of removal are available to victims of harm inflicted by private actors, without regard to state involvement, see, e.g., In re Kasinga, 21 I. & N. Dec. 357, 365 (BIA 1996); In re H, 21 I. & N. Dec. 337, 343344 (BIA 1996).

8 Other considerations that are not presented in this case, such as an aliens lack of knowledge that he was involved in a persecutory act, could likewise indicate that he did not act with the requisite culpability. See, e.g., Castańeda-Castillo v. Gonzales, 488 F. 3d 17, 2022 (CA1 2007) (en banc); Hernandez v. Reno, 258 F. 3d 806, 814 (CA8 2001).

on writ of certiorari to the united states court ofappeals for the fifth circuit

[March 3, 2009]

Justice Stevens, with whom Justice Breyer joins, concurring in part and dissenting in part.

The narrow question of statutory construction presented by this case is whether the so-called persecutor bar,
8 U. S. C. §§1101(a)(42), disqualifies from asylum or withholding of removal an alien whose conduct was coerced or otherwise the product of duress. If the answer to that threshold question is no, courts should defer to the Attorney Generals evaluation of particular circumstances that may or may not establish duress or coercion in individual cases. But the threshold question the Court addresses today is a pure question of statutory construction for the courts to decide. INS v. Cardoza-Fonseca,
480 U. S. 421,
446 (1987)
. For that reason, while I agree with the Courts cogent explanation of why its misguided decision in Fedorenko v. United States,
449 U. S. 490 (1981)
, does not govern our interpretation of the persecutor bar, I would provide a definite answer to the question presented and then remand for further proceedings.

I

Judicial deference to agencies views on statutes they administer was not born in Chevron U. S. A. Inc. v. Natural Resources Defense Council, Inc.,
467 U. S. 837 (1984)
, nor did the singularly judicial role of marking the boundaries of agency choice, Young v. Community Nutrition Institute,
476 U. S. 974,
988 (1986)
(Stevens, J., dissenting), die with that case. In the years before Chevron, this Court recognized that statutory interpretation is a multifaceted enterprise, ranging from a precise construction of statutory language to a determination of what policy best effectuates statutory objectives. We accordingly acknowledged that a complete interpretation of a statutory provision might demand both judicial construction and administrative explication. E.g., NLRB v. Hearst Publications, Inc.,
322 U. S. 111 (1944)
(construing the term employee in the National Labor Relations Act but deferring to the National Labor Relations Boards finding that newsboys were employees); see Nathanson, Administrative Discretion in the Interpretation of Statutes, 3 Vand. L. Rev. 470 (1950).

Chevron adhered to this approach. There, we recognized that the Clean Air Act did not define stationary source,
42 U. S. C. §7502(b)(6) (1982 ed.), but rather implicitly delegated to the Environmental Protection Agency (EPA) the policy question whether States could treat entire plants or only their discrete pollution-emitting devices as sources of pollution for purposes of the Acts permit program. Congress left a gap for the agency to fill, and the agency brought its expertise, political acuity, and information-gathering abilities to bear in doing so.See Chevron, 467 U. S., at 865866.1 In keeping with precedent, see id., at 843845, and nn. 9, 1114, our opinion reaffirmed both that [t]he judiciary is the final authority on issues of statutory construction, id., at 843, n. 9, and that courts should defer to an agencys reasonable formulation of policy in response to an explicit or implicit congressional delegation of authority. The Chevron framework thus accounts for the different institutional competencies of agencies and courts: Courts are expert at statutory construction, while agencies are expert at statutory implementation. That the distinction can be subtle does not lessen its importance.

In the 25 years since Chevron was decided, this Court has continued to recognize that courts and agencies play complementary roles in the project of statutory interpretation. We have repeatedly held that ambiguities in statutes within an agencys jurisdiction to administer are delegations of authority to the agency to fill the statutory gap in reasonable fashion. National Cable & Telecommunications Assn. v. Brand X Internet Services,
545 U. S. 967,
980 (2005)
. But even when confronted with a statute that involves a degree of ambiguityas most statutes dowe have not abdicated our judicial role. The fact that Congress has left a gap for the agency to fill means that courts should defer to the agencys reasonable gap-filling decisions, not that courts should cease to mark the bounds of delegated agency choice.2

In cases involving agency adjudication, we have sometimes described the courts role as deciding pure questions of statutory construction and the agencys role as applying law to fact. See, e.g., Cardoza-Fonseca,
480 U. S. 421; NLRB v. Food & Commercial Workers,
484 U. S. 112 (1987)
; see also Republic of Austria v. Altmann,
541 U. S. 677,
701702 (2004)
. While this phrasing is peculiar to the adjudicatory context, the principle applies to Chevrons domain more broadly. In the context of agency rulemaking, for instance, we might distinguish between pure questions of statutory interpretation and policymaking, or between central legal issues and interstitial questions. See Barnhart v. Walton,
535 U. S. 212,
222 (2002)
.3 The label is immaterial. What matters is the principle: Certain aspects of statutory interpretation remain within the purview of the courts, even when the statute is not entirely clear, while others are properly understood as delegated by Congress to an expert and accountable administrative body. Statutory language may thus admit of both judicial construction and agency exposition.

II

Two of this Courts cases construing the Immigration and Nationality Act (INA),
66Stat.
166,
8 U. S. C. §1101et seq., illustrate the proper division of responsibility between courts and agencies and highlight when Chevron deference is appropriate and when it is not. In Cardoza-Fonseca,the question was whether the standard of INA §243(h),
8 U. S. C. §1253(h) (1982 ed.), which requires an alien to show that she is more likely than not to be subject to persecution if she is deported, also governs applications for asylum under §208(a),
8 U. S. C. §1158(a) (1982 ed.), which authorizes the Attorney General to grant asylum to an alien who has a well-founded fear of persecution in her home country. After considering the INAs language, its legislative history, and the United Nations Protocol that Congress had implemented, the Court determined that the two standards are not the same.

In so holding, we decisively rejected the Governments contention, echoed by Justice Scalias concurrence in the judgment, that the Board of Immigration Appeals (BIA) interpretation of the statute merited deference under our then-recent decision in Chevron. The question whether Congress intended the two standards to be identical is a pure question of statutory construction for the courts to decide, we stated. 480 U. S., at 446. We therefore did not defer to the BIAs interpretation of the two standards as equivalent but instead employed traditional tools of statutory construction and concluded that Congress did not intend the two standards to be identical. Ibid.4

Importantly, we recognized that Chevron deference need not be an all-or-nothing venture. Even after the question of the standards equivalency was resolved, there remained the question of their application. We explained, The narrow legal question whether the two standards are the same is, of course, quite different from the question of interpretation that arises in each case in which the agency is required to apply either or both standards to a particular set of facts. 480 U. S., at 448. And we noted that applying the INA was a task particularly suited to the agencys unique competencies:There is obviously some ambiguity in a term like well-founded fear which can only be given concrete meaning through a process of case-by-case adjudication. In that process of filling  any gap left, implicitly or explicitly by Congress,  the courts must respect the interpretation of the agency to which Congress has delegated the responsibility for administering the statutory program. Ibid. (quoting Chevron, 467 U. S., at 843, in turn quoting Morton v. Ruiz,
415 U. S. 199,
231 (1974)
).

In INS v. Aguirre-Aguirre,
526 U. S. 415 (1999)
, the Court encountered just the type of agency decision Cardoza-Fonseca indicated would warrant Chevron deference. The BIA had denied withholding of deportation because it found that the respondent had committed a serious nonpolitical crime before he entered the United States,
8 U. S. C. §1253(h)(2)(C) (1994 ed.). The Court of Appeals reversed the agencys decision and required it to supplement its balancing test with specific additional factors (such as whether the respondents acts were grossly out of proportion to their objective and whether the acts were politically necessary and successful).

We reversed the Court of Appeals, concluding that Chevron deference should be accorded to the BIA as it gives ambiguous statutory terms concrete meaning through a process of case-by-case adjudication.  526 U. S., at 425 (quoting Cardoza-Fonseca,480 U. S., at 448). The BIAs formulation of a test to apply the statutory standard in individual cases and its application of that test in respondents case were precisely the sort of agency actions that merited judicial deference.

III

The threshold question the Court addresses today is the kind of pure question of statutory construction for the courts to decide that we answered in Cardoza-Fonseca, id., at 446, rather than a fact-intensive question of the kind we addressed in Aguirre-Aguirre. Just as we decided the narrow legal question presented in Cardoza-Fonseca but did not attempt to set forth a detailed description of how the well-founded fear test should be applied, 480 U. S., at 448, I would decide the narrow legal question now before us and remand for the agency to determine how the persecutor bar applies in individual cases.5

For reasons similar to those set forth in my dissent in Fedorenko, I think it plain that the persecutor bar does not disqualify from asylum or withholding of removal an alien whose conduct was coerced or otherwise the product of duress. Although I agree in full with the Courts conclusion that the majority opinion in Fedorenko does not govern our interpretation of the persecutor bar, the differences the Court highlights between the Displaced Persons Act of 1948 (DPA),
62Stat.
1009, and the Refugee Act of 1980,
94Stat.
102, only strengthen my conclusion that voluntary assistance in persecution is required and that duress and coercion vitiate voluntariness.

The Fedorenko Courts construction of the DPA threatened to exclude from the United States concentration camp prisoners who were forced to assist the Nazis in the persecution of other prisoners. In my view, this construction was insupportablethe DPAs exclusion of persons who assisted the enemy in persecuting civil populations, Constitution of the International Refugee Organization, Annex I, Part II, §2(a),
62Stat.
3051, did not extend to concentration camp prisoners who did so involuntarily. These prisoners were victims, not persecutors.

Without an exception for involuntary action, the Refugee Acts bar would similarly treat entire classes of victims as persecutors. The Act does not support such a reading. The language of the persecutor bar is most naturally read to denote culpable conduct, and this reading is powerfully supported by the statutory context and legislative history.

As this Court has previously recognizedand as the majority acknowledges again todayCongress passed the Refugee Act to implement the United Nations Convention Relating to the Status of Refugees, 189 U. N. T. S. 150 (July 28, 1951) (hereinafter Convention), reprinted in 19 U. S. T. 6259, and the 1967 United Nations Protocol Relating to the Status of Refugees, Jan. 31, 1967, [1968] 19 U. S. T. 6223, T. I. A. S. No. 6577 (hereinafter Protocol). These treaties place a mandatory obligation on signatory states not to expel or return (refouler) a refugee in any manner whatsoever to … territories where his life or freedom would be threatened on account of his race, religion, nationality, membership of a particular social group or political opinion. Convention, Art. 33(1), 19 U. S. T., at 6276; Protocol, Art. I, 19 U. S. T., at 6225. The Refugee Acts withholding of removal provision specifically tracks this language.
8 U. S. C. §1231(b)(3)(A); see H. R. Rep. No. 96608, p. 18 (1979) (withholding of removal provision clearly reflects our legal obligations under international agreements, specifically Convention Article 33).6

The Convention excludes from the nonrefoulement obligation of Article 33 persons who have committed a crime against peace, a war crime, or a crime against humanity. Convention, Art. 1(F)(a), 19 U. S. T., at 6263. It is this exception that the persecutor bar reflects. See, e.g., H. R. Rep. No. 96608, at 18 (persecutor bar encompasses exceptions … provided in the Convention relating to aliens who have themselves participated in persecution); H. R. Conf. Rep. No. 96781, p. 20 (1980). The language of the Conventions exception is critical: We do not normally convict individuals of crimes when their actions are coerced or otherwise involuntary. Indeed, the United Nations Handbook, to which the Court has looked for guidance in the past, states that all relevant factors, including mitigating circumstances, must be considered in determining whether an aliens acts are of a criminal nature as contemplated by Article 1(F). Office of the United Nations High Commissioner for Refugees, Handbook on Procedures and Criteria for Determining Refugee Status ¶¶157, 162 (reedited Jan. 1992). Other states parties to the Convention and Protocol likewise read the Conventions exception as limited to culpable conduct.7 When we interpret treaties, we consider the interpretations of the courts of other nations, and we should do the same when Congress asks us to interpret a statute in light of a treatys language. See Zicherman v. Korean Air Lines Co.,
516 U. S. 217,
226228 (1996)
. Congress effort to conform United States law to the standard set forth in the U. N. Convention and Protocol shows that it intended the persecutor bar to apply only to culpable, voluntary actsand it underscores that Congress did not delegate the question presented by this case to the agency.

While I would hold that the persecutor bar does not automatically disqualify from asylum or withholding of removal an alien who acted involuntarily,8 I would leave for the Attorney Generaland, through his own delegation, the BIAthe question how the voluntariness standard should be applied. The agency would retain the ability, for instance, to define duress and coercion; to determine whether or not a balancing test should be employed; and, of course, to decide whether any individual asylum-seekers acts were covered by the persecutor bar. Those are the sorts of questions suited to the agencys unique competencies in administering the INA. The threshold question before the Court is not.

IV

Because I remain convinced that the narrower interpretation of Chevron endorsed by the Court in Cardoza-Fonseca was more faithful to the rationale of that case than the broader view the Court adopts today, I am unable to join its opinion. I would answer the question of law that this case presents with an unequivocal no and remand to the agency for further proceedings.

Notes

1 Notably, the EPA cast its activity not as statutory construction but as public administration; its rulemaking sought to achieve policy goals, such as reducing regulatory complexity and promoting plant modernization. See
46Fed. Reg.
50766 (1981). To be sure, the EPA argued that its regulation defining stationary source as an entire plant was permissible under the Clean Air Act, but the agency treated its rulemaking as a matter of fashioning sound policy, not of discerning the meaning of stationary source in the statute.

2 Cf. United States v. Mead Corp.,
533 U. S. 218,
236238 (2001)
; Barnhart v. Walton,
535 U. S. 212,
222 (2002)
(noting that Mead indicated that whether a court should give [Chevron] deference depends in significant part upon the interpretive method used and the nature of the question at issue).

3 The Administrative Procedure Act draws a similar distinction in providing that courts shall decide all relevant questions of law [and] interpret constitutional and statutory provisions but shall review agency action, findings, and conclusions under the arbitrary and capricious/abuse of discretion standard.
5 U. S. C. §706.

4 Justice Scalia objected in particular to the majoritys holding that pure questions of statutory construction are for the courts, not agencies, to decide; he insisted this was unfaithful to Chevron, since in Chevron the Court deferred to the Environmental Protection Agencys abstract interpretation of the phrase stationary source.  480 U. S., at 455 (opinion concurring in judgment). The majority rejected Justice Scalias argument, recognizing that Chevron involved an agencys complex policy judgment about how to fill a statutory gap, not a pure question of statutory construction. See 480 U. S., at 445448, and n. 29 (quoting extensively from Chevron).

5 The majority suggests that this approach is inconsistent with the  ordinary remand rule  articulated in Gonzales v. Thomas,
547 U. S. 183 (2006)
(per curiam), and INS v. Orlando Ventura,
537 U. S. 12 (2002)
(per curiam). Ante, at 1112. But those cases involved exactly the sort of application of law to fact that is within the agencys purview. In Thomas, the Court of Appeals decided that the family at issue fell within the scope of the statutory term particular social group.  547 U. S., at 185. We noted that the BIA had not considered this question, which require[d] determining the facts and deciding whether the facts as found f[e]ll within a statutory term. Id., at 186. Accordingly, we held that the court should have remanded to the agency. Similarly, in Ventura, the Court of Appeals addressed an issue that the BIA had not reached and concluded that conditions in Guatemala had so improved that no realistic threat of persecution currently existed. The Government argued that the court had not respected the BIAs role as fact-finder, 537 U. S., at 16, and we agreed, reversing the courts judgment insofar as it had not remanded to the agency.

6 Asylum and withholding of removal address concerns different from those addressed by the Convention Against Torture and Other Cruel, Inhuman, or Degrading Treatment or Punishment (CAT) and its implementing regulations. CAT, Dec. 10, 1984, S. Treaty Doc. No. 10020 (1988), 1465 U. N. T. S. 85; 8 CFR §§1208.161208.18 (2008). The CAT prohibits a state party from returning any person to a country where there is substantial reason to believe he might be tortured, but its definition of torture covers a narrower class of harms, imposed by a narrower class of actors, than the asylum and witholding of removal provisions. Most importantly, the CAT limits its definition of torture to acts inflicted by or at the instigation of or with the consent or acquiescence of a public official or other person acting in an official capacity, Pt. I, Art. 1, ¶1, p. 19, while asylum and withholding of removal are available to victims of harm inflicted by private actors, without regard to state involvement, see, e.g., In re Kasinga, 21 I. & N. Dec. 357, 365 (BIA 1996); In re H, 21 I. & N. Dec. 337, 343344 (BIA 1996).

8 Other considerations that are not presented in this case, such as an aliens lack of knowledge that he was involved in a persecutory act, could likewise indicate that he did not act with the requisite culpability. See, e.g., Castańeda-Castillo v. Gonzales, 488 F. 3d 17, 2022 (CA1 2007) (en banc); Hernandez v. Reno, 258 F. 3d 806, 814 (CA8 2001).

on writ of certiorari to the united states court ofappeals for the fifth circuit

[March 3, 2009]

Justice Stevens, with whom Justice Breyer joins, concurring in part and dissenting in part.

The narrow question of statutory construction presented by this case is whether the so-called persecutor bar,
8 U. S. C. §§1101(a)(42), disqualifies from asylum or withholding of removal an alien whose conduct was coerced or otherwise the product of duress. If the answer to that threshold question is no, courts should defer to the Attorney Generals evaluation of particular circumstances that may or may not establish duress or coercion in individual cases. But the threshold question the Court addresses today is a pure question of statutory construction for the courts to decide. INS v. Cardoza-Fonseca,
480 U. S. 421,
446 (1987)
. For that reason, while I agree with the Courts cogent explanation of why its misguided decision in Fedorenko v. United States,
449 U. S. 490 (1981)
, does not govern our interpretation of the persecutor bar, I would provide a definite answer to the question presented and then remand for further proceedings.

I

Judicial deference to agencies views on statutes they administer was not born in Chevron U. S. A. Inc. v. Natural Resources Defense Council, Inc.,
467 U. S. 837 (1984)
, nor did the singularly judicial role of marking the boundaries of agency choice, Young v. Community Nutrition Institute,
476 U. S. 974,
988 (1986)
(Stevens, J., dissenting), die with that case. In the years before Chevron, this Court recognized that statutory interpretation is a multifaceted enterprise, ranging from a precise construction of statutory language to a determination of what policy best effectuates statutory objectives. We accordingly acknowledged that a complete interpretation of a statutory provision might demand both judicial construction and administrative explication. E.g., NLRB v. Hearst Publications, Inc.,
322 U. S. 111 (1944)
(construing the term employee in the National Labor Relations Act but deferring to the National Labor Relations Boards finding that newsboys were employees); see Nathanson, Administrative Discretion in the Interpretation of Statutes, 3 Vand. L. Rev. 470 (1950).

Chevron adhered to this approach. There, we recognized that the Clean Air Act did not define stationary source,
42 U. S. C. §7502(b)(6) (1982 ed.), but rather implicitly delegated to the Environmental Protection Agency (EPA) the policy question whether States could treat entire plants or only their discrete pollution-emitting devices as sources of pollution for purposes of the Acts permit program. Congress left a gap for the agency to fill, and the agency brought its expertise, political acuity, and information-gathering abilities to bear in doing so.See Chevron, 467 U. S., at 865866.1 In keeping with precedent, see id., at 843845, and nn. 9, 1114, our opinion reaffirmed both that [t]he judiciary is the final authority on issues of statutory construction, id., at 843, n. 9, and that courts should defer to an agencys reasonable formulation of policy in response to an explicit or implicit congressional delegation of authority. The Chevron framework thus accounts for the different institutional competencies of agencies and courts: Courts are expert at statutory construction, while agencies are expert at statutory implementation. That the distinction can be subtle does not lessen its importance.

In the 25 years since Chevron was decided, this Court has continued to recognize that courts and agencies play complementary roles in the project of statutory interpretation. We have repeatedly held that ambiguities in statutes within an agencys jurisdiction to administer are delegations of authority to the agency to fill the statutory gap in reasonable fashion. National Cable & Telecommunications Assn. v. Brand X Internet Services,
545 U. S. 967,
980 (2005)
. But even when confronted with a statute that involves a degree of ambiguityas most statutes dowe have not abdicated our judicial role. The fact that Congress has left a gap for the agency to fill means that courts should defer to the agencys reasonable gap-filling decisions, not that courts should cease to mark the bounds of delegated agency choice.2

In cases involving agency adjudication, we have sometimes described the courts role as deciding pure questions of statutory construction and the agencys role as applying law to fact. See, e.g., Cardoza-Fonseca,
480 U. S. 421; NLRB v. Food & Commercial Workers,
484 U. S. 112 (1987)
; see also Republic of Austria v. Altmann,
541 U. S. 677,
701702 (2004)
. While this phrasing is peculiar to the adjudicatory context, the principle applies to Chevrons domain more broadly. In the context of agency rulemaking, for instance, we might distinguish between pure questions of statutory interpretation and policymaking, or between central legal issues and interstitial questions. See Barnhart v. Walton,
535 U. S. 212,
222 (2002)
.3 The label is immaterial. What matters is the principle: Certain aspects of statutory interpretation remain within the purview of the courts, even when the statute is not entirely clear, while others are properly understood as delegated by Congress to an expert and accountable administrative body. Statutory language may thus admit of both judicial construction and agency exposition.

II

Two of this Courts cases construing the Immigration and Nationality Act (INA),
66Stat.
166,
8 U. S. C. §1101et seq., illustrate the proper division of responsibility between courts and agencies and highlight when Chevron deference is appropriate and when it is not. In Cardoza-Fonseca,the question was whether the standard of INA §243(h),
8 U. S. C. §1253(h) (1982 ed.), which requires an alien to show that she is more likely than not to be subject to persecution if she is deported, also governs applications for asylum under §208(a),
8 U. S. C. §1158(a) (1982 ed.), which authorizes the Attorney General to grant asylum to an alien who has a well-founded fear of persecution in her home country. After considering the INAs language, its legislative history, and the United Nations Protocol that Congress had implemented, the Court determined that the two standards are not the same.

In so holding, we decisively rejected the Governments contention, echoed by Justice Scalias concurrence in the judgment, that the Board of Immigration Appeals (BIA) interpretation of the statute merited deference under our then-recent decision in Chevron. The question whether Congress intended the two standards to be identical is a pure question of statutory construction for the courts to decide, we stated. 480 U. S., at 446. We therefore did not defer to the BIAs interpretation of the two standards as equivalent but instead employed traditional tools of statutory construction and concluded that Congress did not intend the two standards to be identical. Ibid.4

Importantly, we recognized that Chevron deference need not be an all-or-nothing venture. Even after the question of the standards equivalency was resolved, there remained the question of their application. We explained, The narrow legal question whether the two standards are the same is, of course, quite different from the question of interpretation that arises in each case in which the agency is required to apply either or both standards to a particular set of facts. 480 U. S., at 448. And we noted that applying the INA was a task particularly suited to the agencys unique competencies:There is obviously some ambiguity in a term like well-founded fear which can only be given concrete meaning through a process of case-by-case adjudication. In that process of filling  any gap left, implicitly or explicitly by Congress,  the courts must respect the interpretation of the agency to which Congress has delegated the responsibility for administering the statutory program. Ibid. (quoting Chevron, 467 U. S., at 843, in turn quoting Morton v. Ruiz,
415 U. S. 199,
231 (1974)
).

In INS v. Aguirre-Aguirre,
526 U. S. 415 (1999)
, the Court encountered just the type of agency decision Cardoza-Fonseca indicated would warrant Chevron deference. The BIA had denied withholding of deportation because it found that the respondent had committed a serious nonpolitical crime before he entered the United States,
8 U. S. C. §1253(h)(2)(C) (1994 ed.). The Court of Appeals reversed the agencys decision and required it to supplement its balancing test with specific additional factors (such as whether the respondents acts were grossly out of proportion to their objective and whether the acts were politically necessary and successful).

We reversed the Court of Appeals, concluding that Chevron deference should be accorded to the BIA as it gives ambiguous statutory terms concrete meaning through a process of case-by-case adjudication.  526 U. S., at 425 (quoting Cardoza-Fonseca,480 U. S., at 448). The BIAs formulation of a test to apply the statutory standard in individual cases and its application of that test in respondents case were precisely the sort of agency actions that merited judicial deference.

III

The threshold question the Court addresses today is the kind of pure question of statutory construction for the courts to decide that we answered in Cardoza-Fonseca, id., at 446, rather than a fact-intensive question of the kind we addressed in Aguirre-Aguirre. Just as we decided the narrow legal question presented in Cardoza-Fonseca but did not attempt to set forth a detailed description of how the well-founded fear test should be applied, 480 U. S., at 448, I would decide the narrow legal question now before us and remand for the agency to determine how the persecutor bar applies in individual cases.5

For reasons similar to those set forth in my dissent in Fedorenko, I think it plain that the persecutor bar does not disqualify from asylum or withholding of removal an alien whose conduct was coerced or otherwise the product of duress. Although I agree in full with the Courts conclusion that the majority opinion in Fedorenko does not govern our interpretation of the persecutor bar, the differences the Court highlights between the Displaced Persons Act of 1948 (DPA),
62Stat.
1009, and the Refugee Act of 1980,
94Stat.
102, only strengthen my conclusion that voluntary assistance in persecution is required and that duress and coercion vitiate voluntariness.

The Fedorenko Courts construction of the DPA threatened to exclude from the United States concentration camp prisoners who were forced to assist the Nazis in the persecution of other prisoners. In my view, this construction was insupportablethe DPAs exclusion of persons who assisted the enemy in persecuting civil populations, Constitution of the International Refugee Organization, Annex I, Part II, §2(a),
62Stat.
3051, did not extend to concentration camp prisoners who did so involuntarily. These prisoners were victims, not persecutors.

Without an exception for involuntary action, the Refugee Acts bar would similarly treat entire classes of victims as persecutors. The Act does not support such a reading. The language of the persecutor bar is most naturally read to denote culpable conduct, and this reading is powerfully supported by the statutory context and legislative history.

As this Court has previously recognizedand as the majority acknowledges again todayCongress passed the Refugee Act to implement the United Nations Convention Relating to the Status of Refugees, 189 U. N. T. S. 150 (July 28, 1951) (hereinafter Convention), reprinted in 19 U. S. T. 6259, and the 1967 United Nations Protocol Relating to the Status of Refugees, Jan. 31, 1967, [1968] 19 U. S. T. 6223, T. I. A. S. No. 6577 (hereinafter Protocol). These treaties place a mandatory obligation on signatory states not to expel or return (refouler) a refugee in any manner whatsoever to … territories where his life or freedom would be threatened on account of his race, religion, nationality, membership of a particular social group or political opinion. Convention, Art. 33(1), 19 U. S. T., at 6276; Protocol, Art. I, 19 U. S. T., at 6225. The Refugee Acts withholding of removal provision specifically tracks this language.
8 U. S. C. §1231(b)(3)(A); see H. R. Rep. No. 96608, p. 18 (1979) (withholding of removal provision clearly reflects our legal obligations under international agreements, specifically Convention Article 33).6

The Convention excludes from the nonrefoulement obligation of Article 33 persons who have committed a crime against peace, a war crime, or a crime against humanity. Convention, Art. 1(F)(a), 19 U. S. T., at 6263. It is this exception that the persecutor bar reflects. See, e.g., H. R. Rep. No. 96608, at 18 (persecutor bar encompasses exceptions … provided in the Convention relating to aliens who have themselves participated in persecution); H. R. Conf. Rep. No. 96781, p. 20 (1980). The language of the Conventions exception is critical: We do not normally convict individuals of crimes when their actions are coerced or otherwise involuntary. Indeed, the United Nations Handbook, to which the Court has looked for guidance in the past, states that all relevant factors, including mitigating circumstances, must be considered in determining whether an aliens acts are of a criminal nature as contemplated by Article 1(F). Office of the United Nations High Commissioner for Refugees, Handbook on Procedures and Criteria for Determining Refugee Status ¶¶157, 162 (reedited Jan. 1992). Other states parties to the Convention and Protocol likewise read the Conventions exception as limited to culpable conduct.7 When we interpret treaties, we consider the interpretations of the courts of other nations, and we should do the same when Congress asks us to interpret a statute in light of a treatys language. See Zicherman v. Korean Air Lines Co.,
516 U. S. 217,
226228 (1996)
. Congress effort to conform United States law to the standard set forth in the U. N. Convention and Protocol shows that it intended the persecutor bar to apply only to culpable, voluntary actsand it underscores that Congress did not delegate the question presented by this case to the agency.

While I would hold that the persecutor bar does not automatically disqualify from asylum or withholding of removal an alien who acted involuntarily,8 I would leave for the Attorney Generaland, through his own delegation, the BIAthe question how the voluntariness standard should be applied. The agency would retain the ability, for instance, to define duress and coercion; to determine whether or not a balancing test should be employed; and, of course, to decide whether any individual asylum-seekers acts were covered by the persecutor bar. Those are the sorts of questions suited to the agencys unique competencies in administering the INA. The threshold question before the Court is not.

IV

Because I remain convinced that the narrower interpretation of Chevron endorsed by the Court in Cardoza-Fonseca was more faithful to the rationale of that case than the broader view the Court adopts today, I am unable to join its opinion. I would answer the question of law that this case presents with an unequivocal no and remand to the agency for further proceedings.

Notes

1 Notably, the EPA cast its activity not as statutory construction but as public administration; its rulemaking sought to achieve policy goals, such as reducing regulatory complexity and promoting plant modernization. See
46Fed. Reg.
50766 (1981). To be sure, the EPA argued that its regulation defining stationary source as an entire plant was permissible under the Clean Air Act, but the agency treated its rulemaking as a matter of fashioning sound policy, not of discerning the meaning of stationary source in the statute.

2 Cf. United States v. Mead Corp.,
533 U. S. 218,
236238 (2001)
; Barnhart v. Walton,
535 U. S. 212,
222 (2002)
(noting that Mead indicated that whether a court should give [Chevron] deference depends in significant part upon the interpretive method used and the nature of the question at issue).

3 The Administrative Procedure Act draws a similar distinction in providing that courts shall decide all relevant questions of law [and] interpret constitutional and statutory provisions but shall review agency action, findings, and conclusions under the arbitrary and capricious/abuse of discretion standard.
5 U. S. C. §706.

4 Justice Scalia objected in particular to the majoritys holding that pure questions of statutory construction are for the courts, not agencies, to decide; he insisted this was unfaithful to Chevron, since in Chevron the Court deferred to the Environmental Protection Agencys abstract interpretation of the phrase stationary source.  480 U. S., at 455 (opinion concurring in judgment). The majority rejected Justice Scalias argument, recognizing that Chevron involved an agencys complex policy judgment about how to fill a statutory gap, not a pure question of statutory construction. See 480 U. S., at 445448, and n. 29 (quoting extensively from Chevron).

5 The majority suggests that this approach is inconsistent with the  ordinary remand rule  articulated in Gonzales v. Thomas,
547 U. S. 183 (2006)
(per curiam), and INS v. Orlando Ventura,
537 U. S. 12 (2002)
(per curiam). Ante, at 1112. But those cases involved exactly the sort of application of law to fact that is within the agencys purview. In Thomas, the Court of Appeals decided that the family at issue fell within the scope of the statutory term particular social group.  547 U. S., at 185. We noted that the BIA had not considered this question, which require[d] determining the facts and deciding whether the facts as found f[e]ll within a statutory term. Id., at 186. Accordingly, we held that the court should have remanded to the agency. Similarly, in Ventura, the Court of Appeals addressed an issue that the BIA had not reached and concluded that conditions in Guatemala had so improved that no realistic threat of persecution currently existed. The Government argued that the court had not respected the BIAs role as fact-finder, 537 U. S., at 16, and we agreed, reversing the courts judgment insofar as it had not remanded to the agency.

6 Asylum and withholding of removal address concerns different from those addressed by the Convention Against Torture and Other Cruel, Inhuman, or Degrading Treatment or Punishment (CAT) and its implementing regulations. CAT, Dec. 10, 1984, S. Treaty Doc. No. 10020 (1988), 1465 U. N. T. S. 85; 8 CFR §§1208.161208.18 (2008). The CAT prohibits a state party from returning any person to a country where there is substantial reason to believe he might be tortured, but its definition of torture covers a narrower class of harms, imposed by a narrower class of actors, than the asylum and witholding of removal provisions. Most importantly, the CAT limits its definition of torture to acts inflicted by or at the instigation of or with the consent or acquiescence of a public official or other person acting in an official capacity, Pt. I, Art. 1, ¶1, p. 19, while asylum and withholding of removal are available to victims of harm inflicted by private actors, without regard to state involvement, see, e.g., In re Kasinga, 21 I. & N. Dec. 357, 365 (BIA 1996); In re H, 21 I. & N. Dec. 337, 343344 (BIA 1996).

8 Other considerations that are not presented in this case, such as an aliens lack of knowledge that he was involved in a persecutory act, could likewise indicate that he did not act with the requisite culpability. See, e.g., Castańeda-Castillo v. Gonzales, 488 F. 3d 17, 2022 (CA1 2007) (en banc); Hernandez v. Reno, 258 F. 3d 806, 814 (CA8 2001).

on writ of certiorari to the united states court ofappeals for the fifth circuit

[March 3, 2009]

Justice Stevens, with whom Justice Breyer joins, concurring in part and dissenting in part.

The narrow question of statutory construction presented by this case is whether the so-called persecutor bar,
8 U. S. C. §§1101(a)(42), disqualifies from asylum or withholding of removal an alien whose conduct was coerced or otherwise the product of duress. If the answer to that threshold question is no, courts should defer to the Attorney Generals evaluation of particular circumstances that may or may not establish duress or coercion in individual cases. But the threshold question the Court addresses today is a pure question of statutory construction for the courts to decide. INS v. Cardoza-Fonseca,
480 U. S. 421,
446 (1987)
. For that reason, while I agree with the Courts cogent explanation of why its misguided decision in Fedorenko v. United States,
449 U. S. 490 (1981)
, does not govern our interpretation of the persecutor bar, I would provide a definite answer to the question presented and then remand for further proceedings.

I

Judicial deference to agencies views on statutes they administer was not born in Chevron U. S. A. Inc. v. Natural Resources Defense Council, Inc.,
467 U. S. 837 (1984)
, nor did the singularly judicial role of marking the boundaries of agency choice, Young v. Community Nutrition Institute,
476 U. S. 974,
988 (1986)
(Stevens, J., dissenting), die with that case. In the years before Chevron, this Court recognized that statutory interpretation is a multifaceted enterprise, ranging from a precise construction of statutory language to a determination of what policy best effectuates statutory objectives. We accordingly acknowledged that a complete interpretation of a statutory provision might demand both judicial construction and administrative explication. E.g., NLRB v. Hearst Publications, Inc.,
322 U. S. 111 (1944)
(construing the term employee in the National Labor Relations Act but deferring to the National Labor Relations Boards finding that newsboys were employees); see Nathanson, Administrative Discretion in the Interpretation of Statutes, 3 Vand. L. Rev. 470 (1950).

Chevron adhered to this approach. There, we recognized that the Clean Air Act did not define stationary source,
42 U. S. C. §7502(b)(6) (1982 ed.), but rather implicitly delegated to the Environmental Protection Agency (EPA) the policy question whether States could treat entire plants or only their discrete pollution-emitting devices as sources of pollution for purposes of the Acts permit program. Congress left a gap for the agency to fill, and the agency brought its expertise, political acuity, and information-gathering abilities to bear in doing so.See Chevron, 467 U. S., at 865866.1 In keeping with precedent, see id., at 843845, and nn. 9, 1114, our opinion reaffirmed both that [t]he judiciary is the final authority on issues of statutory construction, id., at 843, n. 9, and that courts should defer to an agencys reasonable formulation of policy in response to an explicit or implicit congressional delegation of authority. The Chevron framework thus accounts for the different institutional competencies of agencies and courts: Courts are expert at statutory construction, while agencies are expert at statutory implementation. That the distinction can be subtle does not lessen its importance.

In the 25 years since Chevron was decided, this Court has continued to recognize that courts and agencies play complementary roles in the project of statutory interpretation. We have repeatedly held that ambiguities in statutes within an agencys jurisdiction to administer are delegations of authority to the agency to fill the statutory gap in reasonable fashion. National Cable & Telecommunications Assn. v. Brand X Internet Services,
545 U. S. 967,
980 (2005)
. But even when confronted with a statute that involves a degree of ambiguityas most statutes dowe have not abdicated our judicial role. The fact that Congress has left a gap for the agency to fill means that courts should defer to the agencys reasonable gap-filling decisions, not that courts should cease to mark the bounds of delegated agency choice.2

In cases involving agency adjudication, we have sometimes described the courts role as deciding pure questions of statutory construction and the agencys role as applying law to fact. See, e.g., Cardoza-Fonseca,
480 U. S. 421; NLRB v. Food & Commercial Workers,
484 U. S. 112 (1987)
; see also Republic of Austria v. Altmann,
541 U. S. 677,
701702 (2004)
. While this phrasing is peculiar to the adjudicatory context, the principle applies to Chevrons domain more broadly. In the context of agency rulemaking, for instance, we might distinguish between pure questions of statutory interpretation and policymaking, or between central legal issues and interstitial questions. See Barnhart v. Walton,
535 U. S. 212,
222 (2002)
.3 The label is immaterial. What matters is the principle: Certain aspects of statutory interpretation remain within the purview of the courts, even when the statute is not entirely clear, while others are properly understood as delegated by Congress to an expert and accountable administrative body. Statutory language may thus admit of both judicial construction and agency exposition.

II

Two of this Courts cases construing the Immigration and Nationality Act (INA),
66Stat.
166,
8 U. S. C. §1101et seq., illustrate the proper division of responsibility between courts and agencies and highlight when Chevron deference is appropriate and when it is not. In Cardoza-Fonseca,the question was whether the standard of INA §243(h),
8 U. S. C. §1253(h) (1982 ed.), which requires an alien to show that she is more likely than not to be subject to persecution if she is deported, also governs applications for asylum under §208(a),
8 U. S. C. §1158(a) (1982 ed.), which authorizes the Attorney General to grant asylum to an alien who has a well-founded fear of persecution in her home country. After considering the INAs language, its legislative history, and the United Nations Protocol that Congress had implemented, the Court determined that the two standards are not the same.

In so holding, we decisively rejected the Governments contention, echoed by Justice Scalias concurrence in the judgment, that the Board of Immigration Appeals (BIA) interpretation of the statute merited deference under our then-recent decision in Chevron. The question whether Congress intended the two standards to be identical is a pure question of statutory construction for the courts to decide, we stated. 480 U. S., at 446. We therefore did not defer to the BIAs interpretation of the two standards as equivalent but instead employed traditional tools of statutory construction and concluded that Congress did not intend the two standards to be identical. Ibid.4

Importantly, we recognized that Chevron deference need not be an all-or-nothing venture. Even after the question of the standards equivalency was resolved, there remained the question of their application. We explained, The narrow legal question whether the two standards are the same is, of course, quite different from the question of interpretation that arises in each case in which the agency is required to apply either or both standards to a particular set of facts. 480 U. S., at 448. And we noted that applying the INA was a task particularly suited to the agencys unique competencies:There is obviously some ambiguity in a term like well-founded fear which can only be given concrete meaning through a process of case-by-case adjudication. In that process of filling  any gap left, implicitly or explicitly by Congress,  the courts must respect the interpretation of the agency to which Congress has delegated the responsibility for administering the statutory program. Ibid. (quoting Chevron, 467 U. S., at 843, in turn quoting Morton v. Ruiz,
415 U. S. 199,
231 (1974)
).

In INS v. Aguirre-Aguirre,
526 U. S. 415 (1999)
, the Court encountered just the type of agency decision Cardoza-Fonseca indicated would warrant Chevron deference. The BIA had denied withholding of deportation because it found that the respondent had committed a serious nonpolitical crime before he entered the United States,
8 U. S. C. §1253(h)(2)(C) (1994 ed.). The Court of Appeals reversed the agencys decision and required it to supplement its balancing test with specific additional factors (such as whether the respondents acts were grossly out of proportion to their objective and whether the acts were politically necessary and successful).

We reversed the Court of Appeals, concluding that Chevron deference should be accorded to the BIA as it gives ambiguous statutory terms concrete meaning through a process of case-by-case adjudication.  526 U. S., at 425 (quoting Cardoza-Fonseca,480 U. S., at 448). The BIAs formulation of a test to apply the statutory standard in individual cases and its application of that test in respondents case were precisely the sort of agency actions that merited judicial deference.

III

The threshold question the Court addresses today is the kind of pure question of statutory construction for the courts to decide that we answered in Cardoza-Fonseca, id., at 446, rather than a fact-intensive question of the kind we addressed in Aguirre-Aguirre. Just as we decided the narrow legal question presented in Cardoza-Fonseca but did not attempt to set forth a detailed description of how the well-founded fear test should be applied, 480 U. S., at 448, I would decide the narrow legal question now before us and remand for the agency to determine how the persecutor bar applies in individual cases.5

For reasons similar to those set forth in my dissent in Fedorenko, I think it plain that the persecutor bar does not disqualify from asylum or withholding of removal an alien whose conduct was coerced or otherwise the product of duress. Although I agree in full with the Courts conclusion that the majority opinion in Fedorenko does not govern our interpretation of the persecutor bar, the differences the Court highlights between the Displaced Persons Act of 1948 (DPA),
62Stat.
1009, and the Refugee Act of 1980,
94Stat.
102, only strengthen my conclusion that voluntary assistance in persecution is required and that duress and coercion vitiate voluntariness.

The Fedorenko Courts construction of the DPA threatened to exclude from the United States concentration camp prisoners who were forced to assist the Nazis in the persecution of other prisoners. In my view, this construction was insupportablethe DPAs exclusion of persons who assisted the enemy in persecuting civil populations, Constitution of the International Refugee Organization, Annex I, Part II, §2(a),
62Stat.
3051, did not extend to concentration camp prisoners who did so involuntarily. These prisoners were victims, not persecutors.

Without an exception for involuntary action, the Refugee Acts bar would similarly treat entire classes of victims as persecutors. The Act does not support such a reading. The language of the persecutor bar is most naturally read to denote culpable conduct, and this reading is powerfully supported by the statutory context and legislative history.

As this Court has previously recognizedand as the majority acknowledges again todayCongress passed the Refugee Act to implement the United Nations Convention Relating to the Status of Refugees, 189 U. N. T. S. 150 (July 28, 1951) (hereinafter Convention), reprinted in 19 U. S. T. 6259, and the 1967 United Nations Protocol Relating to the Status of Refugees, Jan. 31, 1967, [1968] 19 U. S. T. 6223, T. I. A. S. No. 6577 (hereinafter Protocol). These treaties place a mandatory obligation on signatory states not to expel or return (refouler) a refugee in any manner whatsoever to … territories where his life or freedom would be threatened on account of his race, religion, nationality, membership of a particular social group or political opinion. Convention, Art. 33(1), 19 U. S. T., at 6276; Protocol, Art. I, 19 U. S. T., at 6225. The Refugee Acts withholding of removal provision specifically tracks this language.
8 U. S. C. §1231(b)(3)(A); see H. R. Rep. No. 96608, p. 18 (1979) (withholding of removal provision clearly reflects our legal obligations under international agreements, specifically Convention Article 33).6

The Convention excludes from the nonrefoulement obligation of Article 33 persons who have committed a crime against peace, a war crime, or a crime against humanity. Convention, Art. 1(F)(a), 19 U. S. T., at 6263. It is this exception that the persecutor bar reflects. See, e.g., H. R. Rep. No. 96608, at 18 (persecutor bar encompasses exceptions … provided in the Convention relating to aliens who have themselves participated in persecution); H. R. Conf. Rep. No. 96781, p. 20 (1980). The language of the Conventions exception is critical: We do not normally convict individuals of crimes when their actions are coerced or otherwise involuntary. Indeed, the United Nations Handbook, to which the Court has looked for guidance in the past, states that all relevant factors, including mitigating circumstances, must be considered in determining whether an aliens acts are of a criminal nature as contemplated by Article 1(F). Office of the United Nations High Commissioner for Refugees, Handbook on Procedures and Criteria for Determining Refugee Status ¶¶157, 162 (reedited Jan. 1992). Other states parties to the Convention and Protocol likewise read the Conventions exception as limited to culpable conduct.7 When we interpret treaties, we consider the interpretations of the courts of other nations, and we should do the same when Congress asks us to interpret a statute in light of a treatys language. See Zicherman v. Korean Air Lines Co.,
516 U. S. 217,
226228 (1996)
. Congress effort to conform United States law to the standard set forth in the U. N. Convention and Protocol shows that it intended the persecutor bar to apply only to culpable, voluntary actsand it underscores that Congress did not delegate the question presented by this case to the agency.

While I would hold that the persecutor bar does not automatically disqualify from asylum or withholding of removal an alien who acted involuntarily,8 I would leave for the Attorney Generaland, through his own delegation, the BIAthe question how the voluntariness standard should be applied. The agency would retain the ability, for instance, to define duress and coercion; to determine whether or not a balancing test should be employed; and, of course, to decide whether any individual asylum-seekers acts were covered by the persecutor bar. Those are the sorts of questions suited to the agencys unique competencies in administering the INA. The threshold question before the Court is not.

IV

Because I remain convinced that the narrower interpretation of Chevron endorsed by the Court in Cardoza-Fonseca was more faithful to the rationale of that case than the broader view the Court adopts today, I am unable to join its opinion. I would answer the question of law that this case presents with an unequivocal no and remand to the agency for further proceedings.

Notes

1 Notably, the EPA cast its activity not as statutory construction but as public administration; its rulemaking sought to achieve policy goals, such as reducing regulatory complexity and promoting plant modernization. See
46Fed. Reg.
50766 (1981). To be sure, the EPA argued that its regulation defining stationary source as an entire plant was permissible under the Clean Air Act, but the agency treated its rulemaking as a matter of fashioning sound policy, not of discerning the meaning of stationary source in the statute.

2 Cf. United States v. Mead Corp.,
533 U. S. 218,
236238 (2001)
; Barnhart v. Walton,
535 U. S. 212,
222 (2002)
(noting that Mead indicated that whether a court should give [Chevron] deference depends in significant part upon the interpretive method used and the nature of the question at issue).

3 The Administrative Procedure Act draws a similar distinction in providing that courts shall decide all relevant questions of law [and] interpret constitutional and statutory provisions but shall review agency action, findings, and conclusions under the arbitrary and capricious/abuse of discretion standard.
5 U. S. C. §706.

4 Justice Scalia objected in particular to the majoritys holding that pure questions of statutory construction are for the courts, not agencies, to decide; he insisted this was unfaithful to Chevron, since in Chevron the Court deferred to the Environmental Protection Agencys abstract interpretation of the phrase stationary source.  480 U. S., at 455 (opinion concurring in judgment). The majority rejected Justice Scalias argument, recognizing that Chevron involved an agencys complex policy judgment about how to fill a statutory gap, not a pure question of statutory construction. See 480 U. S., at 445448, and n. 29 (quoting extensively from Chevron).

5 The majority suggests that this approach is inconsistent with the  ordinary remand rule  articulated in Gonzales v. Thomas,
547 U. S. 183 (2006)
(per curiam), and INS v. Orlando Ventura,
537 U. S. 12 (2002)
(per curiam). Ante, at 1112. But those cases involved exactly the sort of application of law to fact that is within the agencys purview. In Thomas, the Court of Appeals decided that the family at issue fell within the scope of the statutory term particular social group.  547 U. S., at 185. We noted that the BIA had not considered this question, which require[d] determining the facts and deciding whether the facts as found f[e]ll within a statutory term. Id., at 186. Accordingly, we held that the court should have remanded to the agency. Similarly, in Ventura, the Court of Appeals addressed an issue that the BIA had not reached and concluded that conditions in Guatemala had so improved that no realistic threat of persecution currently existed. The Government argued that the court had not respected the BIAs role as fact-finder, 537 U. S., at 16, and we agreed, reversing the courts judgment insofar as it had not remanded to the agency.

6 Asylum and withholding of removal address concerns different from those addressed by the Convention Against Torture and Other Cruel, Inhuman, or Degrading Treatment or Punishment (CAT) and its implementing regulations. CAT, Dec. 10, 1984, S. Treaty Doc. No. 10020 (1988), 1465 U. N. T. S. 85; 8 CFR §§1208.161208.18 (2008). The CAT prohibits a state party from returning any person to a country where there is substantial reason to believe he might be tortured, but its definition of torture covers a narrower class of harms, imposed by a narrower class of actors, than the asylum and witholding of removal provisions. Most importantly, the CAT limits its definition of torture to acts inflicted by or at the instigation of or with the consent or acquiescence of a public official or other person acting in an official capacity, Pt. I, Art. 1, ¶1, p. 19, while asylum and withholding of removal are available to victims of harm inflicted by private actors, without regard to state involvement, see, e.g., In re Kasinga, 21 I. & N. Dec. 357, 365 (BIA 1996); In re H, 21 I. & N. Dec. 337, 343344 (BIA 1996).

8 Other considerations that are not presented in this case, such as an aliens lack of knowledge that he was involved in a persecutory act, could likewise indicate that he did not act with the requisite culpability. See, e.g., Castańeda-Castillo v. Gonzales, 488 F. 3d 17, 2022 (CA1 2007) (en banc); Hernandez v. Reno, 258 F. 3d 806, 814 (CA8 2001).